Red Hat Linux Security Advisories & CVEs
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Latest Red Hat advisories
Medium [CVE-2026-19695] Stack-based Buffer Overflow in Wireshark
Gammu DCT3 trace file parser crash in 4.6.0 to 4.6.7 allows denial of service This issue occurs when malformed packets are decoded from a packet capture file, causing a stack-based buffer overflow, resulting in a denial of service. This issue will cause a crash in Wireshark, with no evidence of arbitrary code execution. This flaw can only be exploited when a malformed packet capture file is processed. Due to these reasons, this vulnerability has been rated with a moderate severity. Red Hat severity: Moderate — CVSS 4.7 (CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-121. Red Hat lists 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 as not affected.
Medium [CVE-2026-19696] Out-of-bounds Write in Wireshark
Ixia IxVeriWave and Vector Informatik BLF file parser crashes in 4.6.0 to 4.6.7 allows denial of service on Windows This issue occurs when malformed packets are decoded from a packet capture file, causing an out-of-bounds write, resulting in a denial of service. This issue will cause a crash in Wireshark, with no evidence of arbitrary code execution. This vulnerability can only be exploited when a malformed packet capture file is processed on a Windows system. Due to these reasons, this flaw has been rated with a moderate severity. Red Hat severity: Moderate — CVSS 6.6 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H). Weakness: CWE-787. Red Hat lists 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 as not affected.
Medium [CVE-2026-18728] Integer underflow in iscsiuio IPv4 DHCP parsing
A flaw was found in open-iscsi. An integer underflow vulnerability in the `iscsiuio` component, specifically during IPv4 Dynamic Host Configuration Protocol (DHCP) parsing, allows a remote attacker on the same local network segment to cause a denial of service. By sending a specially crafted IPv4/UDP DHCP reply, the attacker can trigger an out-of-bounds read, leading to the `iscsiuio` process crashing. This issue affects systems where `iscsiuio` is actively handling IPv4 DHCP traffic. This flaw in `iscsi-initiator-utils` is rated Moderate. It allows an adjacent-network attacker to trigger a denial of service by sending a crafted IPv4/UDP DHCP reply to systems where `iscsiuio` is configured to use IPv4 DHCP. Exploitation requires specific network conditions and a vulnerable configuration, limiting its broader impact. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-191. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: iscsi-initiator-utils.
Medium [CVE-2026-68454] Fix handling of AIF enable without AISB
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Fix handling of AIF enable without AISB When a guest seeks to register IRQs without a summary bit specified, ensure that the associated GAITE then stores 0 for the guest AISB location instead of virt_to_phys(page_address(NULL)). A flaw was found in the KVM (Kernel-based Virtual Machine) subsystem of the Linux kernel, affecting the s390 PCI implementation. When a guest operating system registers interrupt requests (IRQs) without a specific summary bit, the system incorrectly stores an invalid memory address. This improper handling of memory addresses can lead to system instability, potentially resulting in a denial of service for the host system. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-476. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: kernel-rt.
Medium [CVE-2026-71846] ClusterRole grants cluster-wide secrets get/list/watch beyond least privilege
A flaw was found in insights-client. The component's ServiceAccount is bound to a ClusterRole granting cluster-wide secrets get, list, and watch permissions, while the code only requires access to a single specific Secret. This is a Moderate flaw in Red Hat Advanced Cluster Management for Kubernetes. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N). Weakness: CWE-250. Red Hat fixing advisory: RHSA-2026:60387, RHSA-2026:60390, RHSA-2026:60388, RHSA-2026:60389, RHSA-2026:60391, RHSA-2026:60386. Affected products named by the advisory: Red Hat Advanced Cluster Management for Kubernetes 2.11; Red Hat Advanced Cluster Management for Kubernetes 2.13; Red Hat Advanced Cluster Management for Kubernetes 2.14; Red Hat Advanced Cluster Management for Kubernetes 2.15; and 2 more.
Medium [CVE-2026-73499] Information disclosure via Watch API authorization bypass
etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.5.33, 3.6.14, and 3.7.1, a user granted READ permission on a single exact key can use the Watch gRPC API with clientv3.WithFromKey() to receive watch events for every key lexicographically greater than or equal to the permitted key. In server/etcdserver/api/v3rpc/watch.go, the open-ended RangeEnd sentinel is rewritten before the RBAC permission check in server/auth/range_perm_cache.go function isRangeOpPermitted, causing the request to be treated as an exact-key watch. Range/Get and DeleteRange requests are not affected, and the issue affects only clusters with authentication enabled. This issue is fixed in versions 3.5.33, 3.6.14, and 3.7.1. This allows them to receive watch events for keys beyond their authorized scope, leading to information disclosure. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N). Weakness: CWE-551. Affected Red Hat products: Multicluster Global Hub; Red Hat Advanced Cluster Management for Kubernetes 2; Red Hat OpenShift Container Platform 4; Red Hat OpenShift GitOps; Red Hat OpenStack Platform 16.2; Red Hat OpenStack Platform 17.1; Red Hat OpenStack Platform 18.0.
Medium [CVE-2026-18727] Integer underflow in iscsiuio DHCPv6 parsing
A flaw was found in open-iscsi's iscsiuio component. This vulnerability involves an integer underflow and out-of-bounds read during Dynamic Host Configuration Protocol for IPv6 (DHCPv6) packet parsing. Specifically, crafted DHCPv6 Advertise traffic with a short User Datagram Protocol (UDP) length can cause the DHCPv6 payload length to underflow. An unauthenticated attacker on an adjacent network segment can exploit this by sending specially crafted IPv6 UDP traffic while the client is in an active DHCPv6 exchange, leading to a denial of service due to a process crash or service disruption. This Moderate flaw in `iscsi-initiator-utils` can lead to an adjacent-network denial of service in the `iscsiuio` DHCPv6 client path. Exploitation requires an attacker on the same L2 segment to send crafted DHCPv6 Advertise traffic while the client is in an active DHCPv6 exchange, limiting its broader impact. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-191. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: iscsi-initiator-utils.
Medium [CVE-2026-18726] Denial of service in iscsiuio Router Advertisement parsing
A flaw was found in open-iscsi. This vulnerability allows a remote attacker on the same local network segment to cause a Denial of Service (DoS) in the iscsiuio daemon. By sending a specially crafted Internet Control Message Protocol version 6 (ICMPv6) Router Advertisement with a zero-length option, the attacker can trigger an infinite loop. This leads to sustained CPU usage, rendering the daemon unresponsive and impacting system availability. A secondary risk of out-of-bounds reads exists with a short IPv6 payload, though no memory corruption or data exposure has been confirmed. Moderate: This flaw in `iscsiuio` can lead to a denial of service when processing a specially crafted ICMPv6 Router Advertisement. Exploitation requires an attacker to be on the same Layer 2 network segment as an IPv6-enabled interface handled by `iscsiuio`, limiting its reachability. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-835. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: iscsi-initiator-utils.
Medium [CVE-2026-73490] SVG `href` attribute bypasses local-reference restriction
Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Prior to 2.25.2, Loofah's HTML5 sanitizer applies its local-reference restriction only to the xlink:href attribute on SVG use and feImage elements, while browsers also accept the plain href attribute. A crafted sanitized SVG can therefore reference an arbitrary same-origin external document; use may render external SVG content containing scripts or other dangerous content, and feImage may load external images for tracking. Applications that sanitize user-supplied SVG with Loofah's default allowlist are affected. This issue is fixed in version 2.25.2. A flaw was found in Loofah. This could lead to information disclosure through external image loading for tracking or potentially script execution by rendering external SVG content containing malicious scripts. Red Hat severity: Moderate — CVSS 4.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N). Weakness: CWE-184. Affected Red Hat products: Red Hat 3scale API Management Platform 2; Red Hat Satellite 6. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2026-73427] Cross-site scripting via crafted JSON drag-and-drop
Trix is a what-you-see-is-what-you-get rich text editor for everyday writing. Prior to 2.1.18, Trix is vulnerable to cross-site scripting when a crafted application/x-trix-document JSON payload is dropped into an editor using the fallback Level0InputController, such as an embedded WebView without Input Events Level 2 support. The StringPiece.fromJSON method trusts href attributes from the JSON payload without sanitization, allowing a draggable element containing a javascript: URI to bypass DOMPurify sanitization and inject executable JavaScript into the DOM. Exploitation requires the victim to drag and drop attacker-controlled content, and server-side HTML sanitization can neutralize the payload on save. This issue is fixed in version 2.1.18. A remote attacker could exploit this vulnerability by convincing a victim to drag and drop a specially crafted JSON payload into an editor using the Level0InputController. This could bypass sanitization and allow the injection of executable JavaScript into the web page, leading to cross-site scripting (XSS). The version of action_text-trix shipped in Red Hat products is not affected by this vulnerability as it already includes the fix. Red Hat severity: Moderate — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N). Weakness: CWE-79.
Medium [CVE-2026-73423] Cross-site Request Forgery (CSRF) due to origin check bypass in `astro/hono` pipeline
Astro is a web framework for content-driven websites. From 7.0.0 until 7.0.6, the composable astro/hono pipeline installs security.checkOrigin only through the middleware() primitive, while actions() and pages() can dispatch to user code independently. Mounting actions() before middleware(), as in the examples/advanced-routing example and Cloudflare Hono documentation, allows cross-origin form-encoded action requests to execute before the origin check, and using pages() without middleware() drops the check for on-demand endpoints and pages. The flaw enables blind write-only cross-site request forgery using the victim's cookies against ActionHandler.handle and PagesHandler.handleWithErrorFallback when manifest.checkOrigin is enabled; the attacker can trigger a state-mutating action or endpoint handler but cannot read the cross-origin response. The default non-composable astro() pipeline is not affected. This issue is fixed in version 7.0.6. A flaw was found in Astro. The composable `astro/hono` pipeline can bypass origin checks, which are designed to prevent unauthorized cross-site requests. This occurs because the `security.checkOrigin` mechanism is not consistently applied when `middleware()` is absent or misordered in the pipeline. Affected product named by the advisory: Red Hat OpenShift AI (RHOAI).
Medium [CVE-2026-73433] unsigned integer underflow in avidemux FUJIFILM strd parsing leading to out-of-bounds read/write
A flaw was found in GStreamer gst-plugins-good (avidemux). When parsing FUJIFILM metadata in an AVI strd chunk, gst_avi_demux_parse_strd() decrements a remaining-length counter by fixed offsets (98 and 10 bytes) without verifying sufficient data remains. For crafted strd payloads of exactly 106 or 107 bytes, the counter underflows to a very large unsigned value, causing subsequent null-terminated string scanning to read far beyond the allocated heap buffer. Date-format normalization may also write beyond the buffer end. Confirmed impacts include heap out-of-bounds read, out-of-bounds write, heap information disclosure (adjacent data appearing in parsed metadata), and application crash/denial of service. The avidemux element is auto-plugged by playbin, decodebin, and gst-discoverer, so opening or previewing a crafted AVI is sufficient to trigger the issue. Red Hat severity: Moderate — CVSS 6.6 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H). Weakness: CWE-191. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 7. Red Hat fixing advisory: RHSA-2026:55434, RHSA-2026:65959, RHSA-2026:56966, RHSA-2026:55436. Affected products named by the advisory: Red Hat package: gstreamer1-plugins-good.
Medium [CVE-2026-73434] out-of-bounds read in avidemux vprp video field descriptor parsing
A flaw was found in GStreamer gst-plugins-good (avidemux). In gst_avi_demux_riff_parse_vprp(), the number of available gst_riff_vprp_video_field_desc entries is calculated by dividing the remaining buffer size by the attacker-controlled vprp->fields value, rather than by sizeof(gst_riff_vprp_video_field_desc). This can cause the parser to treat more field descriptors as available than fit in the input buffer, resulting in out-of-bounds reads. Processing a crafted AVI via playbin/decodebin can crash the application (denial of service). Red Hat severity: Moderate — CVSS 6.1 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H). Weakness: CWE-125. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 7. Red Hat fixing advisory: RHSA-2026:55434, RHSA-2026:65959, RHSA-2026:56966, RHSA-2026:55436. Affected products named by the advisory: Red Hat package: gstreamer1-plugins-good.
Medium [CVE-2026-19130] cross-namespace credential propagation via attacker-controlled copiedFrom labels bypasses authorization
A flaw was found in the provider-credential-controller component of multicluster-engine (MCE). An attacker with specific permissions on the hub cluster, and knowledge of a prior credential value, could exploit an authorization bypass vulnerability. By manipulating `copiedFrom` labels, the attacker could intercept newly rotated provider credentials, leading to unauthorized information disclosure. This allows access to sensitive credentials that should otherwise be protected. This vulnerability is rated as having an Important impact in multicluster-engine because unauthorized cross-namespace credential propagation allows low-privileged tenants to compromise updated provider secrets, breaking multi-tenant isolation boundaries. Although exploitation requires high complexity—namely having Secret creation rights in a namespace, knowing the exact pre-rotation credential value, and awaiting an administrative credential rotation—the resulting compromise grants unauthorized access to sensitive provider infrastructure. In typical hub cluster environments, Secret creation privileges within individual namespaces are commonly granted to developers or tenant administrators, elevating the risk of credential interception. Red Hat severity: Important — CVSS 5.8 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N). Weakness: CWE-639.
Medium [CVE-2026-73295] Material for MkDocs: DOM-based Cross-Site Scripting via crafted URL parameter
Material for MkDocs is a powerful documentation framework built on top of MkDocs. From 7.2.0 until 9.7.7, the mountSearchSuggest function in src/templates/assets/javascripts/components/search/suggest/index.ts contains a DOM-based cross-site scripting vulnerability in the optional search.suggest feature that allows a crafted q URL parameter to execute JavaScript in a documentation site's origin after user interaction. This issue is fixed in version 9.7.7. A remote attacker could exploit this by crafting a malicious URL with a specially designed query parameter. After user interaction, this could lead to the execution of arbitrary JavaScript code in the context of the documentation site, potentially resulting in information disclosure or other client-side attacks. The vulnerability affects an optional search suggestion feature, which limits its immediate impact on typical Red Hat deployments where this feature may not be enabled by default. Red Hat severity: Moderate — CVSS 5.4 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N). Weakness: CWE-79. Affected Red Hat products: Red Hat Certification Program for Red Hat Enterprise Linux 9; Red Hat Developer Hub; Red Hat OpenShift Container Platform 4; Self-service automation portal 2. Red Hat lists Red Hat Hardened Images as not affected. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2026-19548] Multiple Use-After-Free in add_archive_element via LTO plugin processing
Multiple Use-After-Free vulnerabilities were found in the add_archive_element function in ld/ldmain.c of the GNU linker (ld), a component of binutils. The root cause is that plugin_maybe_claim() in ld/plugin.c frees the original BFD object via bfd_close/_bfd_delete_bfd when entry->the_bfd->my_archive == NULL, but the caller retains both the original abfd parameter and a shallow copy (orig_input.the_bfd) as dangling pointers. These dangling pointers are subsequently dereferenced at three distinct locations in add_archive_element: 1. Line ~1442: accessing abfd->my_archive via bfd_usrdata(abfd->my_archive) 2. Line ~1493: multiple accesses to abfd and abfd->my_archive in a conditional check and bfd_get_filename call 3. Line ~1525: dereferencing the shallow copy orig_input.the_bfd->my_archive in trace/verbose logging The vulnerability is triggered when LTO plugins are active (link_info.lto_plugin_active is true) and the input object has abfd->my_archive == NULL, which is a valid state for standalone object files. Red Hat builds binutils with --enable-plugins and --enable-lto, confirming the vulnerable code path is compiled in and reachable. An attacker who can supply a crafted object or archive file to a build process using LTO-enabled linking could exploit this flaw to cause a denial of service (linker crash via segmentation fault).
Medium [CVE-2026-18725] Out-of-bounds access in iscsiuio ICMPv6 echo handling
AI_ONLY_REPORT package: iscsi-initiator-utils-6.2.1.11-0.git4b3e853.el10 ------ Summary: Out-of-Bounds Write and Information Disclosure via Unvalidated IPv6 Payload Length: crafted ICMPv6 Echo Requests can cause `iscsiuio` to trust an inflated `ipv6_plen` larger than the actual received payload, leading to MTU-bounded out-of-bounds reads and a potential one-byte out-of-bounds write that may disclose data beyond the valid packet boundary. Requirements to exploit: Adjacent-network access on the same L2 segment as a system running `iscsiuio` on an interface that processes IPv6/NDP traffic, plus the ability to send a crafted ICMPv6 Echo Request with a forged `IPv6.plen`. No authentication or user interaction is required. Component affected: `iscsi-initiator-utils` (`iscsiuio`): `iscsiuio/src/uip/ipv6.c` in `ipv6_icmp_handle_echo_request()` and `ipv6_insert_protocol_chksum()`. Version affected: `iscsi-initiator-utils-6.2.1.11-0.git4b3e853.el10` when `iscsiuio` is processing IPv6/NDP traffic on a reachable interface. Patch available: no released package fix established; proposed patch included below Version fixed: unknown Upstream coordination: Not notified. CVSS: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L - 6.3 (MEDIUM) AV:A - Reachability is limited to an attacker on the same L2 segment who can send crafted IPv6/ICMPv6 traffic to the affected interface.
Medium [CVE-2026-18663] pre-authentication double-free in get_ldapmessage_controls_ext via critical Session Tracking control
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function frees the parsed controls array on the Session Tracking critical-control rejection path without clearing the SLAPI_REQCONTROLS pblock slot. Operation teardown then frees the same pointer again, causing a double-free. An unauthenticated remote attacker can trigger this with a single BIND request carrying a critical Session Tracking control, resulting in heap corruption and potential denial of service. Red Hat rates this issue as Moderate severity primarily because the exploitation requires sending an unauthenticated BIND request with a critical Session Tracking control, but on RHEL 10 and RHDS 13 the ns-slapd process uses jemalloc, which absorbs the double-free without crashing. Live testing confirmed the error path is hit but the server continues running. Impact is limited to heap corruption; no information disclosure or privilege escalation has been demonstrated. Reliable denial of service only occurs on builds using the glibc allocator (upstream/Fedora), not on RHEL product builds. Other versions are not affected as they lack the Session Tracking control feature. Weakness: CWE-415. Affected Red Hat products: Red Hat Directory Server 13; Red Hat Enterprise Linux 10. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: 389-ds-base.
Medium [CVE-2026-9318] Arbitrary JavaScript execution via stored Cross-Site Scripting in HTML export
tablib prior to 3.10.0 contains a stored cross-site scripting vulnerability in the HTML export functionality that allows attackers to execute arbitrary JavaScript by embedding malicious payloads in dataset titles, which are interpolated unsanitized into HTML output via the export_book method in the _html.py format handler. Attackers can rename worksheet sheets in imported files such as XLSX, ODS, XLS, or YAML with script payloads that are assigned to the Dataset title attribute and rendered unescaped inside an HTML h3 tag, leading to session hijacking, unauthorized administrative actions, and sensitive data exposure when the output is rendered in a browser. A flaw was found in tablib. By embedding malicious payloads within dataset titles, which are not properly sanitized during HTML export, an attacker can trigger the execution of these scripts when the exported HTML is viewed in a browser. Exploitation requires an attacker to embed malicious JavaScript in dataset titles within imported files, which then executes when a user renders the exported HTML in a browser. Red Hat products that process untrusted data and utilize tablib for HTML export are affected, as this could lead to session hijacking or unauthorized actions. Red Hat severity: Moderate — CVSS 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N). Weakness: CWE-79.
Medium [CVE-2026-19587] Denial of Service due to excessive resource allocation
Uncontrolled Resource Consumption vulnerability in Samsung Open Source rlottie allows Excessive Allocation. A flaw was found in rlottie, an open-source animation library. This uncontrolled resource consumption vulnerability allows a remote attacker to cause a Denial of Service (DoS) by tricking a user into processing a specially crafted input that leads to excessive memory or CPU allocation. This can make the affected system or application unresponsive or crash. Moderate: This flaw in the rlottie animation library can lead to a Denial of Service due to excessive resource allocation when processing specially crafted input. Exploitation requires user interaction, as an attacker must trick a user into opening a malicious animation file. This limits the attack vector, preventing unauthenticated, unassisted remote exploitation. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-1050.