CVE-2026-12326
7.3 HIGHMemory safety bugs present in Firefox 151 and Thunderbird 151
Published: 2026-06-16 · Last updated: 2026-06-16
Severity and scoring
- CVSS
- 7.3 HIGH
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- CWE
- CWE-119
Description
Memory safety bugs present in Firefox 151 and Thunderbird 151. 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 code. This vulnerability was fixed in Firefox 152 and Thunderbird 152.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-12326
- [Other]https://bugzilla.mozilla.org/buglist.cgi?bug_id=1767455%2C2004308%2C2024445%2C2028182%2C2029765%2C2029883%2C2030110%2C2030149%2C2030366%2C2030374%2C2030564%2C2031120%2C2033411%2C2038695%2C2042465%2C2042781%2C2042907
- [Other]https://bugzilla.mozilla.org/buglist.cgi?bug_id=2021955%2C2025960%2C2029066%2C2029403%2C2029435%2C2029803%2C2030570%2C2030573%2C2032264%2C2033234%2C2034816%2C2035907%2C2035963%2C2036895%2C2036898%2C2036907%2C2036909%2C2036928%2C2036931%2C2036932%2C2036934%2C2039238%2C2039463
- [Other]https://bugzilla.mozilla.org/buglist.cgi?bug_id=2039050%2C2042718%2C2042760%2C2044831%2C2045307%2C2045398%2C2045516%2C2045572%2C2041741%2C2044433
- [Other]https://www.mozilla.org/security/advisories/mfsa2026-57/
- [Other]https://www.mozilla.org/security/advisories/mfsa2026-60/
Related CVEs
Same CWE
- CVE-2026-12330 — Incorrect boundary conditions in the Internationalization component (5.4 MEDIUM)
- CVE-2026-12329 — Memory safety bug fixed in Thunderbird ESR 140.12 (5.3 MEDIUM)
- CVE-2026-12327 — Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151 (7.3 HIGH)
- CVE-2026-12318 — Incorrect boundary conditions in the Libraries component in NSS (7.3 HIGH)
- CVE-2026-12317 — Memory safety bug fixed in Thunderbird 152 (7.5 HIGH)