Red Hat Linux Security Advisories & Vulnerabilities
16004 advisories tracked · Red Hat Security Data API · direct feeds checked every minute; rate-limited sources checked less often
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Pick your distribution release to see every advisory issued for it and its severity mix. Fixes ship as errata, so keep the system patched. This is the release's advisory history, not a per-package scan.
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Red Hat Enterprise Linux errata (RHSA) via the official Red Hat Security Data API — CVE severity, CVSS and affected packages. A credential-free official source.
Latest Red Hat advisories
Medium [CVE-2026-12315] Mitigation bypass in the DOM: Security component
Mitigation bypass in the DOM: Security component. Red Hat rates this moderate (CVSS 6.1). Weakness: CWE-807. Affected package(s): firefox, thunderbird. Resolved in Red Hat advisory RHSA-2026:29940 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 1.
Medium [CVE-2026-12314] Memory safety bug fixed in Thunderbird ESR 140.12
Memory safety bug fixed in Thunderbird ESR 140.12. Red Hat rates this moderate (CVSS 6.1). Weakness: CWE-787. Affected package(s): firefox, thunderbird. Resolved in Red Hat advisory RHSA-2026:29940 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 1.
Medium [CVE-2026-12313] Information disclosure, sandbox escape in the Security: Process Sandboxing component
Information disclosure, sandbox escape in the Security: Process Sandboxing component. Red Hat rates this moderate (CVSS 6.1). Weakness: CWE-403. Affected package(s): firefox, thunderbird. Resolved in Red Hat advisory RHSA-2026:29940 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 1.
Medium [CVE-2026-12311] Information disclosure, sandbox escape in the Security: Process Sandboxing component
Information disclosure, sandbox escape in the Security: Process Sandboxing component. Red Hat rates this moderate (CVSS 6.1). Weakness: CWE-243. Affected package(s): firefox, thunderbird. Resolved in Red Hat advisory RHSA-2026:29940 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 1.
Medium [CVE-2026-12310] Memory safety bug fixed in Thunderbird ESR 140.12
Memory safety bug fixed in Thunderbird ESR 140.12. Red Hat rates this moderate (CVSS 6.1). Weakness: CWE-825. Affected package(s): firefox, thunderbird. Resolved in Red Hat advisory RHSA-2026:29940 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 1.
Medium [CVE-2026-12308] Memory safety bug fixed in Thunderbird ESR 140.12
Memory safety bug fixed in Thunderbird ESR 140.12. Red Hat rates this moderate (CVSS 6.1). Affected package(s): firefox, thunderbird. Resolved in Red Hat advisory RHSA-2026:29940 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 1.
Medium [CVE-2026-12304] Same-origin policy bypass in the Networking: Cookies component
Same-origin policy bypass in the Networking: Cookies component. Red Hat rates this moderate (CVSS 6.1). Weakness: CWE-346. Affected package(s): firefox, thunderbird. Resolved in Red Hat advisory RHSA-2026:29940 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 1.
Medium [CVE-2026-12302] Mitigation bypass in the DOM: Security component
Mitigation bypass in the DOM: Security component. Red Hat rates this moderate (CVSS 6.1). Affected package(s): firefox, thunderbird. Resolved in Red Hat advisory RHSA-2026:29940 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 1.
Low [CVE-2026-12325] Denial-of-service in the Graphics: ImageLib component
Denial-of-service in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12. Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory. Red Hat severity: Low — CVSS 3.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N). Weakness: CWE-1286. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.8 Telecommunications Update Service; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.
Low [CVE-2026-12324] Incorrect boundary conditions in the Graphics: CanvasWebGL component
Incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory. Red Hat severity: Low — CVSS 3.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N). Weakness: CWE-131. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.8 Telecommunications Update Service; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.
Critical [CVE-2026-48853] elixir-grpc grpc: Remote Code Execution and Denial of Service via Deserialization of Untrusted Data
elixir-grpc grpc: Remote Code Execution and Denial of Service via Deserialization of Untrusted Data. Red Hat rates this critical (CVSS 9.8). Weakness: CWE-502. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected product named by the advisory: Red Hat Enterprise Linux.
High [CVE-2026-12205] Crypt::DSA: Crypt::DSA: Private-key recovery via nonce reuse across signatures
Crypt::DSA: Crypt::DSA: Private-key recovery via nonce reuse across signatures. Red Hat rates this important (CVSS 7.1). Weakness: CWE-323. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected product named by the advisory: Red Hat Enterprise Linux.
High [CVE-2026-53704] out-of-bounds read in realmedia demuxer fileinfo metadata parser
A flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly package. When processing a RealMedia file containing a specially crafted FILEINFO metadata section, the demuxer parses variable-name and variable-value pairs using re_skip_pascal_string() without validating that offsets remain within the mapped buffer. Additionally, the element count controlling the parsing loop is read from attacker-controlled data without validation, which can cause an infinite loop. A crafted RealMedia file can cause the application to crash, hang, or potentially read limited adjacent memory contents. This flaw affects gstreamer1-plugins-ugly-free as shipped in Red Hat Enterprise Linux. RealMedia is a legacy container format with limited real-world usage. The upstream maintainer confirmed only out-of-bounds reads are present, which can lead to crashes and possible limited information disclosure. No code execution or memory corruption path has been identified. No upstream fix is available yet as the surrounding rmdemux code requires a broader rewrite. Red Hat severity: Moderate — CVSS 7.1 (CVSS:3.1/AV:N/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 9; Red Hat Enterprise Linux 9.6 Extended Update Support.
High [CVE-2026-53703] out-of-bounds read in realmedia demuxer audio stream header parser
A vulnerability was found in the GStreamer RealMedia demuxer (gst-plugins-ugly). When processing a RealMedia (.rm) file, the demuxer parses MDPR (media properties) chunks to configure audio streams. For audio stream header versions 4 and 5, the parser reads fields such as codec type, packet size, sample rate, channel count, and extra codec data length from fixed offsets within the chunk without first checking that the chunk contains enough data. If a malicious file provides an MDPR chunk that is too small to contain a complete audio stream header, the parser reads beyond the end of the buffer. This can cause the application to crash. In some cases, bytes read past the buffer boundary may be incorporated into stream metadata, which could result in limited information disclosure. This flaw affects gstreamer1-plugins-ugly-free as shipped in Red Hat Enterprise Linux. RealMedia is a legacy container format with limited real-world usage. No code execution or memory corruption path has been identified. No upstream fix is available yet as the surrounding rmdemux code requires a broader rewrite. Red Hat severity: Moderate — CVSS 7.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H). Weakness: CWE-125.
High [CVE-2026-8357] Arbitrary code execution via heap buffer overflow in formula compilation
Arbitrary code execution via heap buffer overflow in formula compilation. Red Hat rates this important (CVSS 7.8). Weakness: CWE-131. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected products named by the advisory: Red Hat Enterprise Linux 8.8 Telecommunications Update Service; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.6 Extended Update Support; and 6 more.
High [CVE-2026-6040] Heap use-after-free allows arbitrary code execution via malformed ODF number format
Heap use-after-free allows arbitrary code execution via malformed ODF number format. Red Hat rates this important (CVSS 7.3). Weakness: CWE-825. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected products named by the advisory: Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
High [CVE-2026-9595] Information disclosure and denial of service via improper proxy configuration
Information disclosure and denial of service via improper proxy configuration. Red Hat rates this important (CVSS 7.1). Weakness: CWE-346. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected product named by the advisory: Red Hat Enterprise Linux.
High [CVE-2026-52719] Out-of-bounds read via JPEG segment length validation in VA decoder
Out-of-bounds read via JPEG segment length validation in VA decoder. Red Hat rates this important (CVSS 7.1). Weakness: CWE-125. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected products named by the advisory: Red Hat Enterprise Linux AppStream (v. 10); Red Hat Enterprise Linux AppStream (v. 9); Red Hat Enterprise Linux CodeReady Linux Builder (v. 10); Red Hat Enterprise Linux CodeReady Linux Builder (v. 9); and 6 more.
High [CVE-2026-52720] Heap buffer overflow via crafted VNC server rectangle in librfb
Heap buffer overflow via crafted VNC server rectangle in librfb. Red Hat rates this important (CVSS 8.8). Weakness: CWE-122. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected products named by the advisory: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; and 7 more.
High [CVE-2026-52722] Signed integer overflow in VMnc decoder cursor payload handling
Signed integer overflow in VMnc decoder cursor payload handling. Red Hat rates this important (CVSS 7.1). Weakness: CWE-190. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected products named by the advisory: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; and 7 more.
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