CVE-2026-12326
Memory safety bugs fixed in Firefox 152 and Thunderbird 152
CVSS Score
7.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | mozilla |
| Product | firefox |
| Ecosystems | |
| Industries | Technology |
| Published | Jun 16, 2026 |
| Last Updated | Jun 16, 2026 |
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Affected Versions
Mozilla / Firefox
All versions affected Mozilla / Thunderbird
All versions affected References
bugzilla.mozilla.org: 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 bugzilla.mozilla.org: 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 bugzilla.mozilla.org: https://bugzilla.mozilla.org/buglist.cgi?bug_id=2039050%2C2042718%2C2042760%2C2044831%2C2045307%2C2045398%2C2045516%2C2045572%2C2041741%2C2044433 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-57/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-60/
Credits
Ashley Zebrowski, Christian Holler, Dan Baker, Jan de Mooij, Jon Coppeard, Maurice Dauer, Nicolas B. Pierron, Nika Layzell, Randell Jesup, Rob Wu, Ryan Hunt, Steve Fink, Tom Schuster, Tomoya Nakanishi, Yannis Juglaret, Serge Guelton and the Mozilla Fuzzing Team