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OpenAdvisories
Critical RHSA-2026:13596 5 CVEs

Red Hat Security Advisory: firefox security update

Published May 5, 2026 · Updated Oct 16, 2026

Ecosystem: Red Hat

Fixed packages 3

ReleasePackageFixed in
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream firefox 0:140.9.1-1.el9_0
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream firefox-debuginfo 0:140.9.1-1.el9_0
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream firefox-debugsource 0:140.9.1-1.el9_0

Vulnerabilities 5

  • Critical 9.8
    CVE-2026-5731

    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

    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 …

    Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi
  • High 8.8
    CVE-2026-5732

    Incorrect boundary conditions, integer overflow in the Graphics: Text component

    Incorrect boundary conditions, integer overflow in the Graphics: Text component. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.

    Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi
  • High 8.1
    CVE-2026-5734

    Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2

    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 …

    Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi
  • High 7.6
    CVE-2026-33636

    LIBPNG has ARM NEON Palette Expansion Out-of-Bounds Read on AArch64

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write exists in libpng's ARM/AArch64 Neon-optimized palett…

    pnggroup libpng fltk libpng1.6 Debian Ubuntu Azure Linux Alpine Wolfi
  • High 7.5
    CVE-2026-33416

    LIBPNG has use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE`

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE` each alias a heap-allocated buffer between `png_str…

    pnggroup libpng openjpeg2 fltk Debian Ubuntu Azure Linux Alpine Wolfi

References

  • article
    https://access.redhat.com/security/updates/classification/#important
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2451805
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2451819
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2455897
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2455901
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2455908
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_13596.json
  • report
    https://access.redhat.com/security/cve/CVE-2026-5731
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-5731
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-5731
  • article
    https://www.mozilla.org/security/advisories/mfsa2026-27/#CVE-2026-5731
  • article
    https://www.mozilla.org/security/advisories/mfsa2026-29/#CVE-2026-5731
  • report
    https://access.redhat.com/security/cve/CVE-2026-5732
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-5732
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-5732
  • article
    https://www.mozilla.org/security/advisories/mfsa2026-27/#CVE-2026-5732
  • article
    https://www.mozilla.org/security/advisories/mfsa2026-29/#CVE-2026-5732
  • report
    https://access.redhat.com/security/cve/CVE-2026-5734
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-5734
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-5734
  • article
    https://www.mozilla.org/security/advisories/mfsa2026-27/#CVE-2026-5734
  • article
    https://www.mozilla.org/security/advisories/mfsa2026-29/#CVE-2026-5734
  • report
    https://access.redhat.com/security/cve/CVE-2026-33416
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-33416
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-33416
  • article
    https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820eb
  • article
    https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667
  • article
    https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25
  • article
    https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1
  • article
    https://github.com/pnggroup/libpng/pull/824
  • article
    https://github.com/pnggroup/libpng/security/advisories/GHSA-m4pc-p4q3-4c7j
  • report
    https://access.redhat.com/security/cve/CVE-2026-33636
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-33636
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-33636
  • article
    https://github.com/pnggroup/libpng/commit/7734cda20cf1236aef60f3bbd2267c97bbb40869
  • article
    https://github.com/pnggroup/libpng/commit/aba9f18eba870d14fb52c5ba5d73451349e339c3
  • article
    https://github.com/pnggroup/libpng/security/advisories/GHSA-wjr5-c57x-95m2