CVE-2026-12328

Description

Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, 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, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

PUBLISHED Reserved 2026-06-15 | Published 2026-06-16 | Updated 2026-06-17 | Assigner mozilla

Product status

Credits

Andrew McCreight, Randell Jesup, Tom Ritter and the Mozilla Fuzzing Team

References

bugzilla.mozilla.org/...042858%2C2042929%2C2042965%2C2043213 (High Severity memory safety bugs fixed in Firefox ESR 115.37, Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152)

www.mozilla.org/security/advisories/mfsa2026-57/

www.mozilla.org/security/advisories/mfsa2026-58/

www.mozilla.org/security/advisories/mfsa2026-59/

www.mozilla.org/security/advisories/mfsa2026-60/

www.mozilla.org/security/advisories/mfsa2026-61/

cve.org (CVE-2026-12328)

nvd.nist.gov (CVE-2026-12328)

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