Red Hat Linux Security Advisories & CVEs
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Latest Red Hat advisories
Medium [CVE-2026-46406] @anthropic-ai/claude-code: Claude Code: Information disclosure and file overwrite via insecure temporary file in /copy command
@anthropic-ai/claude-code: Claude Code: Information disclosure and file overwrite via insecure temporary file in /copy command. Red Hat rates this moderate (CVSS 6.8). Weakness: CWE-59.
Medium [CVE-2026-11979] Arbitrary code execution in xmlcatalog utility via buffer overflow
Arbitrary code execution in xmlcatalog utility via buffer overflow. Red Hat rates this moderate (CVSS 4.8). Weakness: CWE-120. Red Hat lists fixing advisory RHSA-2026:33840 with package libxml2-main-2.15.3-0.1.1.hum1.
Medium [CVE-2026-54370] TOCTOU Symlink Traversal via getfacl/setfacl
TOCTOU Symlink Traversal via getfacl/setfacl. Red Hat rates this moderate (CVSS 6.3). Weakness: CWE-367. Red Hat lists fixing advisory RHSA-2026:34351 with package acl-main-2.4.0-0.1.hum1.
Medium [CVE-2026-54371] Symlink Traversal Privilege Escalation via getfattr and setfattr
Symlink Traversal Privilege Escalation via getfattr and setfattr. Red Hat rates this moderate (CVSS 6.3). Weakness: CWE-59. Red Hat lists fixing advisory RHSA-2026:34889 with package attr-main-2.6.0-9.1.hum1.
Medium [CVE-2026-41991] Arbitrary file overwrite via insecure temporary file handling in gzexe utility
Arbitrary file overwrite via insecure temporary file handling in gzexe utility. Red Hat rates this moderate (CVSS 6). Weakness: CWE-59. Red Hat lists fixing advisory RHSA-2026:33771 with package gzip-main-1.14-2.2.hum1.
Medium [CVE-2026-53325] Fix broken error propagation in agp_amd64_probe
Fix broken error propagation in agp_amd64_probe(). Red Hat rates this low (CVSS 5.5). Weakness: CWE-476.
Medium [CVE-2026-13503] antlr ANTLR4: Path traversal via manipulation of getImportedVocabFile function
A vulnerability was detected in antlr ANTLR4 up to 4.13.2. Affected by this issue is the function getImportedVocabFile of the file tool/src/org/antlr/v4/parse/TokenVocabParser.java of the component tokenVocab Grammar Option Handler. The manipulation results in path traversal. The attack can be executed remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way. This could allow unauthorized access to sensitive files and directories on the system. Successful exploitation requires a specific scenario where an application using ANTLR4 is configured to accept and parse untrusted, attacker-supplied grammar files containing a manipulated tokenVocab option. Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N). Weakness: CWE-22. 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.
Medium [CVE-2026-13484] Unauthorized access and data manipulation via missing API authorization
A vulnerability has been found in MLflow up to 4666cffc7912ea606d592fc38d6a75e2935f65e7. The impacted element is an unknown function of the component Experiment-scoped Label Schema CRUD API. Such manipulation leads to missing authorization. It is possible to launch the attack remotely. A high complexity level is associated with this attack. The exploitability is regarded as difficult. The exploit has been disclosed to the public and may be used. A reply to the GitHub issue explains, that "[t]he labeling schema PR has not been merged yet. The auth handlers will be added before the release." A flaw was found in MLflow. This could lead to unauthorized access or manipulation of data within the affected component. This issue primarily affects specific MLflow components within the OpenShift AI environment. Red Hat severity: Moderate — CVSS 5 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L). Weakness: CWE-639. Affected Red Hat products: Red Hat OpenShift AI (RHOAI). Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2026-58058] Denial of Service via crafted IPv6 response
Nmap through 7.99 does not keep the IPv6 extension-header walk within the captured packet in ipv6_get_data_primitive (libnetutil/netutil.cc), so the pointer advances past the buffer and the remaining-length computation underflows to a large value. A scanned target or on-path attacker returning a crafted IPv6 response with a truncated extension header can trigger out-of-bounds reads and a crash during raw IPv6 scans. A flaw was found in Nmap. This can lead to an integer underflow, causing out-of-bounds reads and a denial of service (DoS) due to a crash during raw IPv6 scans. Red Hat rates this flaw as Moderate rather than the AI-assigned Important severity. The Aegis AI-Bot rated UI:N (no user interaction), but nmap is a command-line scanning tool that an operator must manually invoke — initiating a scan is user interaction per the CVSS definition of UI:R. Correcting UI:N to UI:R reduces the CVSS from 7.5 to 6.5, aligning with the upstream CVEORG assessment. Weakness: CWE-125. 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; Red Hat OpenShift Container Platform 4. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2026-58051] Denial of service or information disclosure via malformed SSH publickey response
libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2_publickey_list_free operating on an uninitialized entry. A malicious SSH server offering the publickey subsystem can use a malformed response to make cleanup free an uninitialized, attacker-influenceable attrs pointer in a connecting libssh2 client. A flaw in libssh2 allows a malicious SSH server to send a malformed public key response, triggering an invalid memory cleanup. This can cause the connecting client application to crash or leak information. Moderate: This flaw in libssh2 can lead to a denial of service or information disclosure in client applications when connecting to a malicious SSH server. The vulnerability arises from improper handling of uninitialized memory during public key list processing, which an attacker can trigger with a specially crafted response. Exploitation requires active interaction with a compromised or malicious server, limiting the attack surface to untrusted connections. Note: Red Hat Enterprise Linux (RHEL) 8 and newer are not affected by this flaw, as they do not ship the libssh2 package. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H). Weakness: CWE-824.
Medium [CVE-2026-48758] @sigstore/core: Signature bypass due to incorrect encoding in preAuthEncoding
sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 3.2.1, the preAuthEncoding function in @sigstore/core uses Node.js ascii encoding when converting the PAE string to bytes, allowing payloadType to be mutated after signing without invalidating the signature and breaking the type-binding guarantee that DSSE is designed to provide. This issue is fixed in version 3.2.1. This encoding truncates Unicode characters to their low byte, allowing an attacker to substitute characters in the payloadType with Unicode variants that produce identical PAE bytes. As a result, the payloadType can be mutated after a digital signature has been applied without invalidating the signature, thereby bypassing the intended type-binding guarantee of the Digital Signature Standard for Entity Authentication (DSSE). 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-347. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift Dev Spaces; Red Hat Satellite 6; Self-service automation portal 2. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2026-54753] `nx graph` dev server permissive CORS policy
Nx is a monorepo solution for TypeScript and polyglot codebases. From 17.0.4 until 22.7.2 and 23.0.0-beta.2, the local HTTP server started by nx graph sent Access-Control-Allow-Origin: * on every response, letting any website a developer visited read the server's responses cross-origin — including the full project graph and the output of the /help endpoint, which runs a target's configured help command. The practical impact is typically cross-origin information disclosure, but can be arbitrary command injection in rare cases. A flaw was found in Nx, a monorepo solution for managing multiple projects. This misconfiguration allows a remote attacker to read sensitive project information, such as the full project graph, from a developer's system when they visit a malicious website. Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N). Weakness: CWE-346. Affected Red Hat products: Red Hat Ansible Automation Platform 2; Red Hat Enterprise Linux 10. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2026-48090] OAuth2 filter late async token completion after stream teardown (UAF / crash risk)
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.37.0 until 1.37.5 and 1.38.3, the HTTP OAuth2 filter (envoy.filters.http.oauth2) can leave an in-flight async token exchange attached to a downstream stream that has already been torn down. A late AsyncClient completion can still invoke OAuth2Filter methods that use StreamDecoderFilterCallbacks after that object’s lifetime has ended, causing undefined behavior, worker crashes (availability loss), and use-after-free / invalid-vptr failures under AddressSanitizer. This is a memory-safety / lifetime issue in the data plane, not a trivial config bug. Remote code execution is not claimed here; the primary demonstrated impact is DoS via crash and UB; any further impact would be deployment- and allocator-dependent. This vulnerability is fixed in 1.37.5 and 1.38.3. Red Hat products ship Envoy versions prior to 1.37.0, which do not contain the vulnerable OAuth2 filter async token exchange code introduced in 1.37.0. Red Hat products are therefore not affected by this vulnerability. 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. Red Hat lists OpenShift Service Mesh 2; OpenShift Service Mesh 3 as not affected.
Medium [CVE-2026-47205] ext_authz Use-After-Free during Stream Teardown with Per-Route Overrides
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.36.0 until 1.36.9, 1.37.5, and 1.38.3, a Use-After-Free (UAF) vulnerability leading to a sudden segmentation fault exists in Envoy's ext_authz HTTP filter when processing per-route authorization overrides concurrently with rapid downstream client disconnects. During standard request lifecycles, Envoy instantiates the ext_authz filter with a foundational authorization client object (client_). If a matched route dictates a dynamic per-route HTTP or gRPC authorization service override, the filter generates a localized client. In the vulnerable implementation, this transient client aggressively overwrote the default client_ unique pointer by executing client_ = std::move(per_route_client). When a client rapidly establishes and subsequently tears down a stream (such as rapidly refreshing a protected WebSocket endpoint), the downstream triggers the ConnectionManagerImpl::doDeferredStreamDestroy() -> ActiveStream::onResetStream() lifecycle. Envoy immediately sequences Filter::onDestroy() in an attempt to securely abort dispatched asynchronous authorization check transactions via client_->cancel(). By destructing the default client abruptly during initiateCall, a memory lifecycle misalignment occurs within the async client manager.
Medium [CVE-2026-47692] PROXY Protocol v2 header generator emits "skipped" TLVs, causing 65 KB attacker-controlled spillover into the upstream application stream
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, PROXY Protocol v2 header generator emits TLVs beyond the maximum length of 65535 bytes, causing a mismatch between bytes written and the length field in the header. This can result in smuggled bytes on the upstream request. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3. A flaw was found in Envoy. An attacker on an adjacent network could exploit this to smuggle bytes into upstream requests. This could potentially bypass security mechanisms or lead to unexpected behavior in how requests are processed. This flaw allows for up to 65 KB of attacker-controlled data to be smuggled into the upstream request, potentially bypassing security controls or corrupting data. This primarily affects deployments where Envoy is configured to use PROXY Protocol v2. Red Hat severity: Moderate — CVSS 4.8 (CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L). Weakness: CWE-130. Affected Red Hat products: OpenShift Service Mesh 2; OpenShift Service Mesh 3. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2026-48706] Envoy Heap Buffer Overflow in TcpStatsdSink
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, a vulnerability exists in Envoy's TCP StatsD sink (TcpStatsdSink), where the thread-local flusher buffer can be overflowed by exceptionally long statistic names (e.g., >16KiB). During formatting, TcpStatsdSink reserves a single contiguous memory slice of 16KiB (FLUSH_SLICE_SIZE_BYTES). If formatting a single metric exceeds the remaining capacity, the flusher initiates a buffer rotation but incorrectly continues to allocate another fixed 16KiB slice. If an attacker can trigger a statistic name longer than 16KiB—for example, by sending an HTTP or gRPC request with an extremely long request path (:path) that is recorded by the grpc_stats filter configured with stats_for_all_methods: true—the flusher will attempt to copy the metric name using memcpy operations beyond the allocated heap buffer boundaries. This leads to a heap write overflow, which can cause immediate denial-of-service (process crash) or potential remote code execution (RCE). This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3. An attacker can exploit a heap write overflow vulnerability in Envoy's TCP StatsD sink by sending exceptionally long statistic names, such as those found in HTTP or gRPC request paths.
Medium [CVE-2026-47204] Denial of Service via Connect protocol request
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.26.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, the envoy.filters.http.grpc_stats filter crashes (null pointer dereference / segfault) when a Connect protocol request (Content-Type: application/connect+proto or application/connect+json) hits a direct_response route. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3. A remote attacker can exploit this vulnerability by sending a specially crafted Connect protocol request to a direct response route. This action causes the `envoy.filters.http.grpc_stats` filter to crash, leading to a denial of service (DoS) for the Envoy process. This can disrupt services relying on the proxy. This vulnerability affects Red Hat OpenShift Service Mesh and cloud.redhat.com services that utilize Envoy, potentially disrupting service availability. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-476. Affected Red Hat products: OpenShift Service Mesh 2; OpenShift Service Mesh 3. Will not fix / out of support: OpenShift Service Mesh 2. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2026-47221] Null pointer deref in internal redirects
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.18.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, the router filter contains a null pointer dereference vulnerability when handling HTTP 303 (See Other) internal redirects for body-less non-GET/HEAD requests. When a POST, PUT, DELETE, or PATCH request without a body is sent to a route configured with internal redirect policy that includes 303 in redirect_response_codes, and the upstream responds with HTTP 303, the redirect handling code attempts to drain a request body buffer that was never allocated. This results in a segmentation fault that crashes the entire Envoy process. When route configured with internal_redirect_policy including 303 in redirect_response_codes and upstream must return HTTP 303 response, an unauthenticated attacker can exploit this to cause complete denial of service, terminating all active connections. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3. A flaw was found in Envoy. 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-476. Affected Red Hat products: OpenShift Service Mesh 2; OpenShift Service Mesh 3. Will not fix / out of support: OpenShift Service Mesh 2. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2026-47778] Information disclosure via malicious certificate with NUL byte in DNS Subject Alternative Name (SAN)
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, a structural flaw was identified in DefaultCertValidator::verifySubjectAltName where the extracted DNS SAN string is cast to a C-style string using.c_str() before being passed to the Utility::dnsNameMatch() algorithm. If the attacker serves a certificate with a dNSName SAN containing an embedded NUL byte, the helper Utility::generalNameAsString captures the complete string including the NUL. However, when.c_str() evaluates it, implicit conversion to absl::string_view inside dnsNameMatch relies on strlen(), prematurely truncating the evaluation context. Envoy evaluates trucated string against the exact required config_san match and returns true, thereby successfully validating the string with the Nul byte for an upstream routing. This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1. A remote attacker could exploit a structural flaw in the DefaultCertValidator::verifySubjectAltName function by presenting a specially crafted certificate. This certificate would contain a NUL byte within its DNS Subject Alternative Name (SAN) field. Due to incorrect string handling, Envoy would prematurely truncate the DNS SAN string during validation, allowing the malicious certificate to be accepted for upstream routing.
Medium [CVE-2026-55686] Host filesystem modification via malicious container image WORKDIR symlink
Podman is a tool for managing OCI containers and pods. From 3.0.0 until 5.7.1, running a malicious container image where the WORKDIR path contains a symlink can create a directory or modify ownership on the host filesystem. Modified ownership is less likely to happen as that requires help from an untrusted/malicious process that mutates the host filesystem tree during dereferencing of the WORKDIR path, to trigger a race condition. This vulnerability is fixed in 5.7.1. A flaw was found in Podman. This can lead to the creation of a directory or modification of ownership on the host filesystem, potentially impacting system integrity. Exploitation requires the user to pull and run a specifically crafted malicious container image. Red Hat rates this as Moderate impact, consistent with the upstream assessment, because the attack requires a malicious image and the most severe outcome (ownership modification) requires additional help from an underprivileged user namespace. Red Hat severity: Moderate — CVSS 5.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N). Weakness: CWE-59. Affected Red Hat products: Red Hat Hardened Images; Red Hat Ansible Automation Platform 2; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4; Red Hat OpenShift Virtualization 4; Red Hat Quay 3. Red Hat fixing advisory: RHSA-2026:29954.