Red Hat Linux Security Advisories & Vulnerabilities
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Latest Red Hat advisories
Medium [CVE-2026-12549 +1] Libsoup: incomplete fix for CVE-2026-2443: range suffix overflow in libsoup soupserver
The fix for CVE-2026-2443 was regressed by a subsequent rework commit that replaced specific overflow checks with a general signed comparison. When a client sends a Range request with a suffix length exceeding the content size, the resulting negative start value is not properly clamped, leading to malformed HTTP 206 responses and log flooding. This vulnerability is rated Moderate for Red Hat because it requires a non-default configuration where max_incoming_payload_size is explicitly set to 0 or unset in libsoup's WebSocket frame processing. In typical Red Hat deployments, this configuration is not enabled by default, limiting the exposure to memory disclosure or application instability. Red Hat severity: Moderate — CVSS 4.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L). Weakness: CWE-805. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: libsoup3.
Medium [CVE-2026-12725] Dnsmasq: dnsmasq: heap buffer overflow in log_query when logging unsupported ds/dnskey replies
A heap-based buffer overflow was found in dnsmasq. When DNSSEC validation and query logging are both enabled, logging of DS or DNSKEY replies containing unsupported algorithm or digest types can cause dnsmasq to write past the end of an internal logging buffer. A remote attacker able to supply such a DNS response may crash the dnsmasq process, resulting in denial of service. Red Hat Product Security rates this issue as Moderate. The overflow occurs in the query logging path only, requires both DNSSEC validation and query logging to be enabled, involves a bounded overwrite with non-attacker-controlled data, and is most appropriately characterized as a denial of service rather than a confidentiality, integrity, or code execution issue. This assessment is consistent with the upstream maintainer's analysis. Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-122. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4. Red Hat lists Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7 as not affected. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: dnsmasq.
Medium [CVE-2026-10601] Tempo and Loki Datasource Plugins: Information disclosure and unauthorized actions via path traversal
A user with Viewer permissions can use specially crafted requests to the Tempo and Loki data source plugins to reach unintended backend endpoints. Depending on the backend configuration this can expose data source credentials, leak internal responses, or trigger administrative actions on the configured backend. A remote attacker with a Viewer role could exploit a path traversal vulnerability by manipulating user-supplied input in URL paths. This could allow the attacker to capture sensitive administrator-configured datasource credentials, invoke state-changing administrative functions on Tempo, or exfiltrate internal service data from Loki. Red Hat severity: Moderate — CVSS 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L). Weakness: CWE-22. Affected Red Hat products: Red Hat Hardened Images; Multicluster Global Hub; Red Hat Advanced Cluster Management for Kubernetes 2; Red Hat Ceph Storage 5; Red Hat Ceph Storage 6; Red Hat Ceph Storage 7; Red Hat Ceph Storage 8; Red Hat Ceph Storage 9; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat lists Red Hat Hardened Images as not affected. Red Hat fixing advisory: RHSA-2026:62527, RHSA-2026:62537, RHSA-2026:64525, RHSA-2026:64585, RHSA-2026:67573, RHSA-2026:67605, RHSA-2026:68143. Affected products named by the advisory: Red Hat package: grafana.
Medium [CVE-2026-6653] Denial of Service via crafted XML input due to use-after-free
Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling. A flaw was found in libxml2. This improper handling of entity resolution can lead to a denial-of-service (DoS), making the affected system or application unavailable. This Moderate impact use-after-free vulnerability in libxml2 can lead to a denial of service in Red Hat products that process untrusted XML input. In the worst-case scenario, a remote attacker is able to provide specially crafted XML, which, if parsed by an affected application, could cause the application to crash. Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-416. Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Cert Manager support for Red Hat OpenShift release 1.17; Cert Manager support for Red Hat OpenShift release 1.18; Cert Manager support for Red Hat OpenShift release 1.20; Red Hat Discovery 2; Red Hat Update Infrastructure 5; Red Hat OpenShift Container Platform 4. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Hardened Images as not affected. Affected products named by the advisory: Red Hat package: libxml2.
Medium [CVE-2026-12892] 1-byte heap out-of-bounds read in H.264 NAL extension slice parser
A flaw was found in GStreamer's gst-plugins-bad package. When processing a specially crafted H.264 video file containing malformed MVC or SVC extension slice NAL units, a 1-byte heap out-of-bounds read can occur during parsing. This happens when the parser attempts to check slice boundary information without first verifying that the NAL unit contains enough data beyond the extension header. An attacker could exploit this by tricking a user into opening a malicious H.264 video file, potentially causing the application to crash or leak a single byte of heap memory. Red Hat product impact analysis pending. Component mapping required to determine which products ship the affected code. The vulnerable code path specifically affects H.264 NAL extension slices (type 20) used in MVC (Multi-view Video Coding) and SVC (Scalable Video Coding) formats, which are less commonly encountered than baseline H.264. The out-of-bounds read is limited to 1 byte and requires local file access with user interaction (opening a crafted video file). Modern Linux distributions include ASLR and stack canaries which provide some defense-in-depth against heap-based vulnerabilities, though these do not prevent the initial out-of-bounds read from occurring. Red Hat severity: Moderate — CVSS 4.4 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L). Weakness: CWE-125.
Low [CVE-2026-55654] Heap out-of-bounds read in Red Hat Enterprise Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination
A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application Programming Interface) indicators when a trailing NULL termination is missing in the auth-indicators array. A remote attacker, under specific configurations involving GSSAPI authentication and a Kerberos environment, could exploit this to cause the SSH authentication path to crash or abort. This leads to a denial of service (DoS), impacting the availability of the SSH service. This flaw is rated Low. A heap out-of-bounds read in OpenSSH's GSSAPI authentication component can lead to a denial of service. Exploitation requires `GSSAPIAuthentication` to be explicitly enabled, which is not the default configuration in Red Hat products, and a Kerberos environment providing authenticated `auth-indicators`. The impact is limited to the availability of the SSH authentication process. This vulnerability doesn't affect the upstream OpenSSH versions and is restricted to the versions as shipped with Red Hat Enterprise Linux. Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-125. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Hardened Images; Red Hat Update Infrastructure 5; Red Hat OpenShift Container Platform 4.
Low [CVE-2026-53663] @remix-run/server-runtime: React Router: Insufficient CSRF protection allows integrity impact
React Router is a router for React. This is a low severity vulnerability because modern browser protections (CORS preflight, SameSite cookies) already block the cross-origin attack vectors that this missing CSRF check would otherwise gate. This vulnerability is fixed in 7.15.1. Insufficient Cross-Site Request Forgery (CSRF) checks in the framework mode allow a remote attacker to bypass these protections on PUT, PATCH, and DELETE requests. This could lead to a low integrity impact, where an attacker might be able to perform unintended actions on behalf of a user. Modern browser security features, such as Cross-Origin Resource Sharing (CORS) preflight and SameSite cookies, significantly limit the practical exploitability of this vulnerability. Red Hat severity: Low — CVSS 3.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N). Weakness: CWE-352. Affected Red Hat products: Exploit Intelligence; Network Observability Operator; OpenShift Pipelines; Red Hat Ansible Automation Platform 2; Red Hat Data Grid 8; Red Hat OpenShift AI (RHOAI); Red Hat OpenShift Container Platform 4; Red Hat Quay 3; Red Hat Trusted Artifact Signer; Red Hat Trusted Profile Analyzer.
Low [CVE-2026-53540] Negative Content-Length in parse_form buffers the entire body in memory
Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.31, parse_form() did not validate the Content-Length header before using it to bound its chunked read of the request body. A negative Content-Length turned the bounded read into a read-until-EOF, so the entire body was loaded into memory in a single read instead of in fixed-size chunks. The realistic exposure is limited to bespoke WSGI or http.server handlers that forward raw client headers directly into parse_form(). Common frameworks such as Starlette and FastAPI do not call parse_form() directly and are not affected by this specific code path. Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-400. Affected Red Hat products: Exploit Intelligence; Migration Toolkit for Applications 8; OpenShift Lightspeed; Red Hat AI Inference Server; Red Hat Ansible Automation Platform 2; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift AI (RHOAI); Red Hat OpenShift Virtualization 4; Red Hat Satellite 6. Red Hat lists OpenShift Lightspeed; Red Hat Hardened Images as not affected. Red Hat does not currently list a fixing RHSA for this CVE.
Low [CVE-2026-53537] Information disclosure via header parsing discrepancy
Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, parse_options_header parsed Content-Disposition (and Content-Type) headers with email.message. Message, which transparently applies RFC 2231/5987 decoding. The extended parameter syntax (filename*=charset'lang'value, name*=..., and the filename*0/filename*1 continuation form) is decoded and surfaced under the bare filename/name key, and overrides the plain parameter when both are present. RFC 7578 §4.2 explicitly forbids the filename* form in multipart/form-data. Components that follow RFC 7578, or that do not implement RFC 2231/5987 decoding for multipart/form-data (WAFs, proxies, gateways), may interpret such a header differently. An attacker can exploit that difference to smuggle a different field name or filename past an upstream inspector to the backend. This vulnerability is fixed in 0.0.30. This vulnerability allows a remote attacker to bypass security controls by exploiting a difference in how Content-Disposition and Content-Type headers are parsed. Specifically, the parse_options_header function incorrectly applies RFC 2231/5987 decoding, which is forbidden for multipart/form-data. This Low impact information disclosure flaw in `python-multipart` stems from a parsing discrepancy in `Content-Disposition` and `Content-Type` headers.
Low [CVE-2026-54276] Information disclosure via DigestAuthMiddleware after cross-origin redirect
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, DigestAuthMiddleware can send an authentication response after following a cross-origin redirect. This likely requires an open redirect vulnerability or similar on the target domain for an attacker to be able to execute. Further, the attacker is only receiving the digest, so should only be able to extract the user's credentials if the cryptography is weak or there is some kind of password reuse. This vulnerability is fixed in 3.14.1. This could allow a remote attacker, in conjunction with an open redirect vulnerability on the target domain, to potentially extract a user's credentials if weak cryptography is used or if there is password reuse. This vulnerability primarily leads to information disclosure. Red Hat severity: Low — CVSS 3.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N). Weakness: CWE-940. Affected Red Hat products: Exploit Intelligence; Migration Toolkit for Applications 8; OpenShift Lightspeed; Red Hat AI Inference Server; Red Hat Ansible Automation Platform 2; Red Hat Ansible Automation Platform Ansible Core 2; Red Hat Discovery 2; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift AI (RHOAI); Red Hat Satellite 6. Red Hat lists Red Hat Hardened Images as not affected. Red Hat does not currently list a fixing RHSA for this CVE.
Low [CVE-2026-49356] @babel/core: @babel/core: Arbitrary file read via sourceMappingURL comment
Babel is a compiler for writing next generation JavaScript. Prior to 8.0.0-rc.6 and 7.29.6, @babel/core affected by an arbitrary file read via a sourceMappingURL comment. Using @babel/core to compile maliciously crafted code can allow an attacker to read any source map from the system that is running Babel, if the attacker controls the input source code, can read the output source code, and knows the path of the source map file that they want to read. This vulnerability is fixed in 8.0.0-rc.6 and 7.29.6. Red Hat rates this issue as having Low impact for Red Hat AI products. @babel/core is bundled only in build-time or developer UI tooling (dashboard, model registry, MLflow) and the arbitrary file read requires local access and attacker-controlled source map processing that is not exposed in normal production use. Red Hat severity: Low — CVSS 3.6 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N). Weakness: CWE-22.
High [CVE-2026-12773] BerriAI litellm: Improper authentication in MCP Proxy via UserAPIKeyAuth function
A weakness has been identified in BerriAI litellm up to 1.59.8. Affected is the function UserAPIKeyAuth of the file litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py of the component MCP Proxy. Executing a manipulation can lead to improper authentication. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure. A flaw was found in BerriAI litellm, within its MCP Proxy component. A remote attacker could exploit an improper authentication vulnerability in the UserAPIKeyAuth function. This could allow unauthorized access, potentially compromising the confidentiality, integrity, and availability of data within the system. When the LiteLLM proxy MCP authentication flow mishandles 401/403 errors from API key validation, an attacker may bypass MCP proxy authentication and reach backend MCP servers that are configured with allow_all_keys: true. This issue affects litellm versions prior to 1.81.16 as shipped in select Red Hat products. Red Hat severity: Important — CVSS 7.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L). Weakness: CWE-303. Affected Red Hat products: Exploit Intelligence. Red Hat lists Red Hat Ansible Automation Platform 2; Red Hat OpenShift AI (RHOAI) as not affected. Red Hat does not currently list a fixing RHSA for this CVE.
High [CVE-2026-56340] Denial of service and potential arbitrary code execution via malformed multimodal embedding requests
vLLM versions >= 0.10.2 and < 0.13.0 are missing sparse tensor validation in multimodal embeddings processing. Because PyTorch disables sparse tensor invariant checks by default, an attacker can submit crafted embedding requests with malformed (negative or out-of-bounds) tensor indices, when the prompt-embeds feature is enabled, to trigger crashes or resource exhaustion (denial of service), with potential for out-of-bounds/write-what-where memory corruption. This continues CVE-2025-62164, whose prior fix only disabled the feature by default rather than addressing the root cause. A flaw was found in vLLM. Red Hat rates this issue as having Important impact for affected Red Hat AI Inference Server images shipping vLLM 0.10.2 through 0.13.x when prompt-embeds multimodal embedding support is enabled. Versions outside this range, Red Hat OpenShift AI KServe sidecars, and Red Hat Enterprise Linux AI 3.4 bootc images (vLLM 0.17+/0.18+) are not affected. Red Hat severity: Important — CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-787. Red Hat lists Red Hat AI Inference Server; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift AI (RHOAI) as not affected. Will not fix / out of support: Red Hat AI Inference Server. Red Hat does not currently list a fixing RHSA for this CVE.
High [CVE-2026-56208] heap buffer overflow in AV1 encoder first-pass stats buffer via LAP mode
A heap buffer overflow vulnerability was found in libaom, the reference AV1 codec implementation. A flaw in the AV1 encoder's Look-Ahead Processing (LAP) mode causes the first-pass stats ring buffer wrap-around guard to be bypassed when g_lag_in_frames is set to 1 or higher. This results in a 232-byte out-of-bounds write on every encoded frame after the second, corrupting adjacent heap objects. An attacker who can influence encoder configuration in a transcoding service or WebRTC session could exploit this to cause a denial of service (process crash) or potentially achieve code execution. This vulnerability is rated as Important severity because a heap buffer overflow with attacker-influenced data can cause reliable denial of service and potentially lead to code execution, though the attacker has only indirect control over the written values (encoder-computed statistics). In Red Hat products, libaom ships bundled within Firefox and Thunderbird as a statically-linked dependency used for AV1 decoding and WebRTC encoding. In Firefox's WebRTC implementation, the encoder configuration is controlled by the browser itself and not exposed to remote peers, which significantly limits the attack surface compared to standalone transcoding services. RHEL-AI 3.4 and Hummingbird 1 ship standalone libaom (aom) packages at versions within the affected range.
High [CVE-2026-56209] arbitrary address write via SVC layer context OOB and cyclic refresh map pointer hijack
An arbitrary address write vulnerability was found in libaom, the reference AV1 codec implementation. A missing bounds check in the SVC (Scalable Video Coding) layer ID control function allows an attacker to inject an arbitrary pointer into the cyclic refresh map field via crafted image pixel values. The encoder then writes approximately 1,200 bytes at the attacker-controlled address. This is fully deterministic and does not require a separate information leak. An attacker who can supply frames to a network-facing libaom encoder with SVC enabled could exploit this for denial of service or potential code execution. The 1,200-byte write at an attacker-chosen address is sufficient for control flow hijacking. In Red Hat products, libaom ships bundled within Firefox and Thunderbird. The vulnerable code path requires the SVC (Scalable Video Coding) encoder feature to be enabled and the attacker to control both the layer_id configuration and the image frame pixel values. In Firefox's WebRTC implementation, SVC encoding parameters and frame submission are managed internally by the browser; a remote peer cannot directly set arbitrary layer IDs or inject pixel values into the local encoder. This significantly reduces exploitability in the browser context. RHEL-AI 3.4 (aom 3.12.0) and Hummingbird 1 (aom 3.13.3) ship standalone libaom packages within the affected version range.
High [CVE-2026-56210] heap-buffer-overflow read via missing bounds check in ctrl_set_layer_id
A heap-buffer-overflow read vulnerability was found in libaom, the reference AV1 codec implementation. A missing bounds check in the SVC (Scalable Video Coding) layer ID control function allows setting a spatial_layer_id exceeding the configured number of layers. This causes an out-of-bounds heap read of approximately 40,728 bytes when computing a layer context array index. An attacker who can influence SVC encoder parameters in a network-facing service could exploit this for information disclosure (heap content leak) or denial of service (segmentation fault from hitting unmapped memory). This vulnerability is rated as Important severity because the 40KB out-of-bounds heap read can disclose sensitive information from adjacent heap allocations (including pointers useful for ASLR bypass in chained attacks) and reliably causes denial of service by hitting unmapped pages. In Red Hat products, libaom ships bundled within Firefox and Thunderbird. The vulnerable code path requires the SVC encoder feature to be enabled and an attacker to set spatial_layer_id to a value exceeding the number of configured spatial layers. In Firefox's WebRTC implementation, SVC layer parameters are managed internally by the browser and not directly exposed to remote peers, which limits exploitability.
High [CVE-2026-56211] remote code execution via SVC layer context handling with attacker-controlled frames
A remote code execution vulnerability was found in libaom, the reference AV1 codec implementation. Insufficient bounds validation in the AV1 encoder's SVC (Scalable Video Coding) layer ID control allows an attacker to supply crafted video frame pixels that overlap with internal encoder layer context structures. In fork-based video processing services, an attacker can use this to hijack the cyclic refresh map pointer, brute-force the process base address via a crash oracle, and redirect control flow to achieve arbitrary command execution. Exploitation requires the target service to use libaom with SVC encoding enabled and accept attacker-supplied video frames. This vulnerability is rated as Critical severity because the researcher demonstrated successful remote code execution against a fork-based video processing service. The exploit chain leverages attacker-controlled pixel values to hijack internal encoder pointers, uses a crash oracle to brute-force ASLR, and ultimately achieves arbitrary command execution. However, the attack complexity is elevated: it requires a fork-based service architecture (for the crash oracle), multiple encoding attempts (for ASLR brute-force), and knowledge of the target binary layout. In Red Hat products, libaom ships bundled within Firefox and Thunderbird.
Medium [CVE-2026-12726] Awx: automation-controller: awx: github webhook second-order ssrf via unvalidated statuses_url exfiltrates pat credential
A flaw was found in the AWX GitHub webhook integration. When processing GitHub pull_request webhooks, the controller stores the pull_request.statuses_url value from the webhook payload without validating that it points to a trusted GitHub API endpoint. If a job template is configured with a GitHub Personal Access Token as its webhook credential, the controller later POSTs that token to the stored callback URL when posting job status updates. An attacker who can submit a correctly signed forged webhook using the job template's webhook_key can redirect the callback to an attacker-controlled URL and exfiltrate the configured GitHub PAT. Red Hat rates this issue as Moderate impact. This flaw affects AWX controller deployments that enable GitHub webhooks with status callback configured (webhook_service=github and a GitHub Personal Access Token configured as webhook_credential on the job template). The controller intentionally uses the configured GitHub PAT to post commit status updates back to GitHub; however, it fails to restrict the callback destination to trusted GitHub API endpoints. When a forged webhook with a valid HMAC signature supplies a malicious statuses_url, the PAT may be sent to an attacker-controlled URL on job completion. Exploitation requires knowledge of the per-job-template webhook_key used to validate incoming webhook requests.
Medium [CVE-2026-52910] Free reuseport cBPF prog after RCU grace period.
In the Linux kernel, the following vulnerability has been resolved: bpf: Free reuseport cBPF prog after RCU grace period. Eulgyu Kim reported the splat below with a repro. [0] The repro sets up a UDP reuseport group with a cBPF prog and replaces it with a new one while another thread is sending a UDP packet to the group. The reuseport prog is freed by sk_reuseport_prog_free(). bpf_prog_put() is called for "e"BPF prog to destruct through multiple stages while cBPF prog is freed immediately by bpf_release_orig_filter() and bpf_prog_free(). If a reuseport prog is detached from the setsockopt() path (reuseport_attach_prog() or reuseport_detach_prog()), sk_reuseport_prog_free() is called without waiting for RCU readers to complete, resulting in various bugs. Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat package: kernel-rt.
Medium [CVE-2026-56132] Arbitrary Code Execution via Heap-based Buffer Overflow
In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers. A flaw was found in libexpat, a library used for parsing XML data. An attacker could exploit a heap-based buffer overflow, a type of memory error, by providing specially crafted XML input. This vulnerability occurs when the library mishandles memory reallocation while processing XML, particularly when multiple parsers share data. Successful exploitation could allow the attacker to execute arbitrary code, access sensitive information, or cause the application to crash, leading to a denial of service. Red Hat severity: Moderate — CVSS 6.9 (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L). Weakness: CWE-131. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Hardened Images; Red Hat Update Infrastructure 5; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat OpenShift Container Platform 4; Red Hat OpenShift Container Platform 5. Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat fixing advisory: RHSA-2026:64810, RHSA-2026:64809, RHSA-2026:64812, RHSA-2026:30647, RHSA-2026:67956.
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