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)...