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OpenAdvisories
High ALSA-2026:19348 30 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: Incorrect boundary conditions in the Libraries component in NSS (CVE-2026-6772)
* firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-6754)
* firefox: thunderbird: Spoofing issue in the DOM: Core & HTML component (CVE-2026-6762)
* firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-6752)
* firefox: thunderbird: Other issue in the Storage: IndexedDB component (CVE-2026-6770)
* firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-6757)
* firefox: thunderbird: Other issue in the Libraries component in NSS (CVE-2026-6767)
* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 (CVE-2026-6786)
* firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-6753)
* firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-6759)
* firefox: thunderbird: Use-after-free in the WebRTC component (CVE-2026-6747)
* firefox: thunderbird: Information disclosure due to uninitialized memory in the Graphics: Canvas2D component (CVE-2026-6749)
* firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS (CVE-2026-6766)
* firefox: thunderbird: Privilege escalation in the Networking component (CVE-2026-6761)
* firefox: thunderbird: Mitigation bypass in the File Handling component (CVE-2026-6763)
* firefox: thunderbird: Privilege escalation in the Graphics: WebRender component (CVE-2026-6750)
* firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component (CVE-2026-6748)
* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 (CVE-2026-6785)
* firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-6771)
* firefox: thunderbird: Incorrect boundary conditions in the DOM: Device Interfaces component (CVE-2026-6764)
* firefox: thunderbird: Information disclosure in the Form Autofill component (CVE-2026-6765)
* firefox: thunderbird: Privilege escalation in the Debugger component (CVE-2026-6769)
* firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component (CVE-2026-6751)
* firefox: thunderbird: Incorrect boundary conditions in the WebRTC: Networking component (CVE-2026-6776)
* firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-6746)
* 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 · 9 thunderbird 140.10.1-1.el9_8.alma.1

Vulnerabilities 30

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-6746
  • report
    https://access.redhat.com/security/cve/CVE-2026-6747
  • report
    https://access.redhat.com/security/cve/CVE-2026-6748
  • report
    https://access.redhat.com/security/cve/CVE-2026-6749
  • report
    https://access.redhat.com/security/cve/CVE-2026-6750
  • report
    https://access.redhat.com/security/cve/CVE-2026-6751
  • report
    https://access.redhat.com/security/cve/CVE-2026-6752
  • report
    https://access.redhat.com/security/cve/CVE-2026-6753
  • report
    https://access.redhat.com/security/cve/CVE-2026-6754
  • report
    https://access.redhat.com/security/cve/CVE-2026-6757
  • report
    https://access.redhat.com/security/cve/CVE-2026-6759
  • report
    https://access.redhat.com/security/cve/CVE-2026-6761
  • report
    https://access.redhat.com/security/cve/CVE-2026-6762
  • report
    https://access.redhat.com/security/cve/CVE-2026-6763
  • report
    https://access.redhat.com/security/cve/CVE-2026-6764
  • report
    https://access.redhat.com/security/cve/CVE-2026-6765
  • report
    https://access.redhat.com/security/cve/CVE-2026-6766
  • report
    https://access.redhat.com/security/cve/CVE-2026-6767
  • report
    https://access.redhat.com/security/cve/CVE-2026-6769
  • report
    https://access.redhat.com/security/cve/CVE-2026-6770
  • report
    https://access.redhat.com/security/cve/CVE-2026-6771
  • report
    https://access.redhat.com/security/cve/CVE-2026-6772
  • report
    https://access.redhat.com/security/cve/CVE-2026-6776
  • report
    https://access.redhat.com/security/cve/CVE-2026-6785
  • report
    https://access.redhat.com/security/cve/CVE-2026-6786
  • 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/2460074
  • report
    https://bugzilla.redhat.com/2460075
  • report
    https://bugzilla.redhat.com/2460076
  • report
    https://bugzilla.redhat.com/2460078
  • report
    https://bugzilla.redhat.com/2460079
  • report
    https://bugzilla.redhat.com/2460085
  • report
    https://bugzilla.redhat.com/2460086
  • report
    https://bugzilla.redhat.com/2460088
  • report
    https://bugzilla.redhat.com/2460092
  • report
    https://bugzilla.redhat.com/2460094