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OpenAdvisories
High RLSA-2026:22325 19 CVEs

Important: thunderbird security update

Published Jun 5, 2026 · Updated Jun 5, 2026

Ecosystem: Rocky Linux

Summary

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

* firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component (CVE-2026-8388)

* firefox: Other issue in the JavaScript Engine component (CVE-2026-8391)

* firefox: Sandbox escape in the Profile Backup component (CVE-2026-8401)

* firefox: Integer overflow in the Networking: JAR component (CVE-2026-8956)

* firefox: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151 (CVE-2026-8975)

* firefox: Privilege escalation in the DOM: Workers component (CVE-2026-8955)

* firefox: Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component (CVE-2026-8968)

* firefox: Incorrect boundary conditions, integer overflow in the Audio/Video component (CVE-2026-8954)

* firefox: Information disclosure, sandbox escape in the Security: Process Sandboxing component (CVE-2026-8958)

* firefox: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-8946)

* firefox: Privilege escalation in the Security component (CVE-2026-8970)

* firefox: Same-origin policy bypass in the Networking: HTTP component (CVE-2026-8950)

* firefox: Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151 (CVE-2026-8974)

* firefox: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-8953)

* firefox: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component (CVE-2026-8959)

* firefox: Spoofing issue in the Form Autofill component (CVE-2026-8961)

* firefox: Use-after-free in the DOM: Bindings (WebIDL) component (CVE-2026-8947)

* firefox: Mitigation bypass in the DOM: Security component (CVE-2026-8962)

* firefox: Privilege escalation in the Enterprise Policies component (CVE-2026-8957)

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
Rocky Linux · 10 thunderbird 0:140.11.0-1.el10_2

Vulnerabilities 19

References

  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479873
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479876
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479842
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2476469
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479846
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479871
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479853
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479839
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2476475
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479855
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479860
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479852
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479880
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479849
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479861
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479847
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479848
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479840
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2476492