Red Hat Security Advisory: thunderbird security update
Affects Red Hat thunderbirdSource GCVE Database
Mentioned vulnerabilities
Not known to be exploited · CVSS 7.5 High · fixed in Red Hat package updates : patch Red Hat thunderbird soon.
Data as of 5 Nov 2026, 20:49 UTC
- Patch
- Available – fixed in 140.13
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NExploitation evidence
Disclosed: evidence found.
CVE published 22 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
Description
Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fix(es): * firefox: thunderbird: Site isolation issue in the DOM: Navigation component (CVE-2026-15719) * firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-15718) * firefox: thunderbird: Mitigation bypass in the Enterprise Policies component (CVE-2026-16390) * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: cubeb component (CVE-2026-16350) * firefox: thunderbird: Information disclosure in the Storage: IndexedDB component (CVE-2026-16391) * firefox: thunderbird: Site isolation issue in the Networking: HTTP component (CVE-2026-16375) * firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16356) * firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-16363) * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.13 and Firefox 153 (CVE-2026-16412) * firefox: thunderbird: Same-origin policy bypass in the Networking: DNS component (CVE-2026-16381) * firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-16355) * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38 and Firefox ESR 140.13 (CVE-2026-16361) * firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16352) * firefox: thunderbird: Incorrect boundary conditions in the JavaScript: WebAssembly component (CVE-2026-16368) * firefox: thunderbird: Mitigation bypass in the PDF Viewer component (CVE-2026-16377) * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38, Firefox ESR 140.13 and Firefox 153 (CVE-2026-16360) * firefox: thunderbird: Use-after-free in the WebRTC: Audio/Video component (CVE-2026-16362) * firefox: thunderbird: Site isolation issue in the Graphics: WebRender component (CVE-2026-16358) * firefox: thunderbird: Site isolation issue in the Networking component (CVE-2026-16387) * firefox: thunderbird: Same-origin policy bypass in the DOM: Navigation component (CVE-2026-16349) * firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-16357) * firefox: thunderbird: Sandbox escape due to use-after-free in the DOM: Navigation component (CVE-2026-16351) * firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-16371) * firefox: thunderbird: Privilege escalation in the DOM: Content Processes component (CVE-2026-16379) * firefox: thunderbird: Information disclosure in the Graphics: ImageLib component (CVE-2026-16354) * firefox: thunderbird: Information disclosure in the Framework component in DevTools (CVE-2026-16374) * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-16359) * firefox: thunderbird: Mitigation bypass in the DOM: Networking component (CVE-2026-16383) * firefox: thunderbird: Integer overflow in the JavaScript: WebAssembly component (CVE-2026-16369) * firefox: thunderbird: Invalid pointer in the DOM: Bindings (WebIDL) component (CVE-2026-16353) * firefox: thunderbird: Privilege escalation in WebExtensions (CVE-2026-16396) * firefox: thunderbird: Information disclosure in the Networking: WebSockets component (CVE-2026-16405) * thunderbird: Off-by-one out of bounds read in MIME header parser for forwarding (CVE-2026-14899) 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.
References
- access.redhat.com/errata/RHSA-2026:53455 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2499973 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2499974 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503415 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503416 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503420 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503423 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503425 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503430 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503432 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503434 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503439 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503440 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503444 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503451 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503454 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503456 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503463 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2503472 (opens in a new tab)