CVE-2026-12329
MEDIUMCVSS 5.3/10EPSS 0.33%
Last modified
CVE-2026-12329 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Memory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12.. EPSS estimates a 0.33% chance of exploitation in the next 30 days.
Description
Memory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | >= 140.0, < 140.12.0 |
| Mozilla | Thunderbird | >= 140.0, < 140.12.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2044738Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-58/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-61/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-12329?
Memory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12.
How severe is CVE-2026-12329?
CVE-2026-12329 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.
How do I fix CVE-2026-12329?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-12323Spoofing issue in the DOM: Core & HTML component. This vulne…5.4
- CVE-2026-12324Incorrect boundary conditions in the Graphics: CanvasWebGL c…7.3
- CVE-2026-12325Denial-of-service in the Graphics: ImageLib component. This …6.5
- CVE-2026-12326Memory safety bugs present in Firefox 151 and Thunderbird 15…8.1
- CVE-2026-12327Memory safety bugs present in Firefox ESR 140.11, Thunderbir…8.1
- CVE-2026-12328Memory safety bugs present in Firefox ESR 115.36, Firefox ES…8.1
- CVE-2026-1233The Text to Speech for WP (AI Voices by Mementor) plugin for…7.5
- CVE-2026-12330Incorrect boundary conditions in the Internationalization co…5.4
- CVE-2026-12339A Zip Slip vulnerability in the WebUI ISP Upgrade functional…6.9
- CVE-2026-12340Out-of-bounds heap read during SM2/SM3 certificate signature…7.5
- CVE-2026-12341This vulnerability impacts all versions of IdentityIQ and al…9.8
- CVE-2026-12348Address bar spoofing in Arc Search for Android allows a remo…7.4
Are you affected by CVE-2026-12329?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST