ALSA-2026:0025 — Important: thunderbird security update

Summary

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

* firefox: Memory safety bugs fixed in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146 (CVE-2025-14333)
* firefox: Use-after-free in the WebRTC: Signaling component (CVE-2025-14321)
* firefox: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2025-14325)
* firefox: Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2025-14322)
* firefox: Privilege escalation in the Netmonitor component (CVE-2025-14328)
* firefox: Privilege escalation in the Netmonitor component (CVE-2025-14329)
* firefox: Same-origin policy bypass in the Request Handling component (CVE-2025-14331)
* firefox: Privilege escalation in the DOM: Notifications component (CVE-2025-14323)
* firefox: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2025-14330)
* firefox: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2025-14324)

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

Release	Package	Fixed in
AlmaLinux · 10	thunderbird	140.6.0-1.el10_1.alma.1

Vulnerabilities 10

Critical 9.8

CVE-2025-14321 Public exploit

Use-after-free in the WebRTC: Signaling component

Use-after-free in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi

Dec 9, 2025
Critical 9.8

CVE-2025-14324

JIT miscompilation in the JavaScript Engine: JIT component

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi

Dec 9, 2025
Critical 9.8

CVE-2025-14330

JIT miscompilation in the JavaScript Engine: JIT component

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi

Dec 9, 2025
High 8.8

CVE-2025-14323

Privilege escalation in the DOM: Notifications component

Privilege escalation in the DOM: Notifications component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi

Dec 9, 2025
High 8.8

CVE-2025-14328

Privilege escalation in the Netmonitor component

Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi

Dec 9, 2025
High 8.8

CVE-2025-14329

Privilege escalation in the Netmonitor component

Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi

Dec 9, 2025
High 8.1

CVE-2025-14333

Memory safety bugs fixed in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146

Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox 145 and Thunderbird 145. 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 co…

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi

Dec 9, 2025
High 8.0

CVE-2025-14322

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi

Dec 9, 2025
High 7.3

CVE-2025-14325 Public exploit

JIT miscompilation in the JavaScript Engine: JIT component

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi

Dec 9, 2025
Medium 6.5

CVE-2025-14331

Same-origin policy bypass in the Request Handling component

Same-origin policy bypass in the Request Handling component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu Wolfi

Dec 9, 2025

References

report
https://access.redhat.com/security/cve/CVE-2025-14321
report
https://access.redhat.com/security/cve/CVE-2025-14322
report
https://access.redhat.com/security/cve/CVE-2025-14323
report
https://access.redhat.com/security/cve/CVE-2025-14324
report
https://access.redhat.com/security/cve/CVE-2025-14325
report
https://access.redhat.com/security/cve/CVE-2025-14328
report
https://access.redhat.com/security/cve/CVE-2025-14329
report
https://access.redhat.com/security/cve/CVE-2025-14330
report
https://access.redhat.com/security/cve/CVE-2025-14331
report
https://access.redhat.com/security/cve/CVE-2025-14333
report
https://bugzilla.redhat.com/2420502
report
https://bugzilla.redhat.com/2420503
report
https://bugzilla.redhat.com/2420504
report
https://bugzilla.redhat.com/2420506
report
https://bugzilla.redhat.com/2420508
report
https://bugzilla.redhat.com/2420509
report
https://bugzilla.redhat.com/2420512
report
https://bugzilla.redhat.com/2420513
report
https://bugzilla.redhat.com/2420516
report
https://bugzilla.redhat.com/2420517
advisory
https://errata.almalinux.org/10/ALSA-2026-0025.html