RHSA-2026:7671

Vulnerability from csaf_redhat - Published: 2026-04-13 02:29 - Updated: 2026-04-14 13:34
Summary
Red Hat Security Advisory: firefox security update
Severity
Important
Notes
Topic: An update for firefox is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. Security Fix(es): * libpng: libpng: Arbitrary code execution due to use-after-free vulnerability (CVE-2026-33416) * libpng: libpng: Information disclosure and denial of service via out-of-bounds read/write in Neon palette expansion (CVE-2026-33636) * thunderbird: firefox: Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2 (CVE-2026-5734) * thunderbird: firefox: Memory safety bugs fixed in Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2 (CVE-2026-5731) * firefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics: Text component (CVE-2026-5732) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-5731

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Memory safety bugs present in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:7671
CVE-2026-5732

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Incorrect boundary conditions, integer overflow in the Graphics: Text component

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-190 - Integer Overflow or Wraparound
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:7671
CVE-2026-5734

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Memory safety bugs present in Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:7671
CVE-2026-33416

A flaw was found in libpng, a library used for processing PNG (Portable Network Graphics) image files. This vulnerability arises from improper memory management where a heap-allocated buffer is aliased between internal data structures. When specific functions are called, a freed memory region can still be referenced, leading to a use-after-free condition. An attacker could potentially exploit this to achieve arbitrary code execution or cause a denial of service.

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:7671
Workaround To reduce exposure, avoid processing untrusted PNG image files with applications that utilize libpng. Restricting the source of PNG images to trusted origins can limit the attack surface.
CVE-2026-33636

A flaw was found in libpng. A remote attacker could exploit an out-of-bounds read and write vulnerability in the ARM/AArch64 Neon-optimized palette expansion path. This occurs when processing a final partial chunk of 8-bit paletted rows without verifying sufficient input pixels, leading to dereferencing pointers before the start of the row buffer and writing expanded pixel data to underflowed positions. This flaw can result in information disclosure and denial of service.

7.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
CWE-124 - Buffer Underwrite ('Buffer Underflow')
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:7671
Workaround Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
References
https://access.redhat.com/errata/RHSA-2026:7671 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2451805 external
https://bugzilla.redhat.com/show_bug.cgi?id=2451819 external
https://bugzilla.redhat.com/show_bug.cgi?id=2455897 external
https://bugzilla.redhat.com/show_bug.cgi?id=2455901 external
https://bugzilla.redhat.com/show_bug.cgi?id=2455908 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-5731 self
https://bugzilla.redhat.com/show_bug.cgi?id=2455901 external
https://www.cve.org/CVERecord?id=CVE-2026-5731 external
https://nvd.nist.gov/vuln/detail/CVE-2026-5731 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-5732 self
https://bugzilla.redhat.com/show_bug.cgi?id=2455908 external
https://www.cve.org/CVERecord?id=CVE-2026-5732 external
https://nvd.nist.gov/vuln/detail/CVE-2026-5732 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-5734 self
https://bugzilla.redhat.com/show_bug.cgi?id=2455897 external
https://www.cve.org/CVERecord?id=CVE-2026-5734 external
https://nvd.nist.gov/vuln/detail/CVE-2026-5734 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-33416 self
https://bugzilla.redhat.com/show_bug.cgi?id=2451805 external
https://www.cve.org/CVERecord?id=CVE-2026-33416 external
https://nvd.nist.gov/vuln/detail/CVE-2026-33416 external
https://github.com/pnggroup/libpng/commit/2301926… external
https://github.com/pnggroup/libpng/commit/7ea9eea… external
https://github.com/pnggroup/libpng/commit/a3a2144… external
https://github.com/pnggroup/libpng/commit/c1b0318… external
https://github.com/pnggroup/libpng/pull/824 external
https://github.com/pnggroup/libpng/security/advis… external
https://access.redhat.com/security/cve/CVE-2026-33636 self
https://bugzilla.redhat.com/show_bug.cgi?id=2451819 external
https://www.cve.org/CVERecord?id=CVE-2026-33636 external
https://nvd.nist.gov/vuln/detail/CVE-2026-33636 external
https://github.com/pnggroup/libpng/commit/7734cda… external
https://github.com/pnggroup/libpng/commit/aba9f18… external
https://github.com/pnggroup/libpng/security/advis… external
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
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    },
    {
      "cve": "CVE-2026-33636",
      "cwe": {
        "id": "CWE-124",
        "name": "Buffer Underwrite (\u0027Buffer Underflow\u0027)"
      },
      "discovery_date": "2026-03-26T18:02:51.339603+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2451819"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in libpng. A remote attacker could exploit an out-of-bounds read and write vulnerability in the ARM/AArch64 Neon-optimized palette expansion path. This occurs when processing a final partial chunk of 8-bit paletted rows without verifying sufficient input pixels, leading to dereferencing pointers before the start of the row buffer and writing expanded pixel data to underflowed positions. This flaw can result in information disclosure and denial of service.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "libpng: libpng: Information disclosure and denial of service via out-of-bounds read/write in Neon palette expansion",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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        {
          "category": "external",
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33636"
        },
        {
          "category": "external",
          "summary": "https://github.com/pnggroup/libpng/commit/7734cda20cf1236aef60f3bbd2267c97bbb40869",
          "url": "https://github.com/pnggroup/libpng/commit/7734cda20cf1236aef60f3bbd2267c97bbb40869"
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          "summary": "https://github.com/pnggroup/libpng/commit/aba9f18eba870d14fb52c5ba5d73451349e339c3",
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
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      ],
      "title": "libpng: libpng: Information disclosure and denial of service via out-of-bounds read/write in Neon palette expansion"
    }
  ]
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.