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OpenAdvisories
High ALSA-2026:19153 5 CVEs

Important: thunderbird security update

Published May 19, 2026 · Updated Nov 6, 2026

Ecosystem: AlmaLinux

Summary

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.10.1 and Firefox 150.0.1 (CVE-2026-7323)
* firefox: thunderbird: Information disclosure due to incorrect boundary conditions in the Audio/Video component (CVE-2026-7320)
* firefox: thunderbird: Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1 (CVE-2026-7322)
* firefox: thunderbird: webrtc: Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component (CVE-2026-7321)

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.

Fixed packages 1

ReleasePackageFixed in
AlmaLinux · 10 thunderbird 140.10.1-1.el10_2.alma.1

Vulnerabilities 5

  • Critical 9.8
    CVE-2026-8091

    Incorrect boundary conditions in the Audio/Video: Playback component

    Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.

    Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi
  • Critical 9.6
    CVE-2026-7321

    Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component

    Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.

    Mozilla Firefox Thunderbird thunderbird Browsers Debian Wolfi
  • High 7.5
    CVE-2026-7320

    Information disclosure due to incorrect boundary conditions in the Audio/Video component

    Information disclosure due to incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.

    Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi
  • High 7.3
    CVE-2026-7322

    Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1

    Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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. This vulnerability wa…

    Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi
  • High 7.3
    CVE-2026-7323

    Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1

    Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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. This vulnerability wa…

    Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-7320
  • report
    https://access.redhat.com/security/cve/CVE-2026-7321
  • report
    https://access.redhat.com/security/cve/CVE-2026-7322
  • report
    https://access.redhat.com/security/cve/CVE-2026-7323
  • report
    https://bugzilla.redhat.com/2463481
  • report
    https://bugzilla.redhat.com/2463483
  • report
    https://bugzilla.redhat.com/2463484
  • report
    https://bugzilla.redhat.com/2463485
  • advisory
    https://errata.almalinux.org/10/ALSA-2026-19153.html
  • report
    https://www.redhat.com/security/data/cve/CVE-2026-8091.html