CVE-2025-5269
Memory safety bug fixed in Firefox ESR 128.11 and Thunderbird 128.11
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 128.11 and Thunderbird 128.11.
| Vendor | mozilla |
| Product | firefox |
| Ecosystems | |
| Industries | Technology |
| Published | May 27, 2025 |
| Last Updated | Apr 13, 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/show_bug.cgi?id=1924108 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-44/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-46/ lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/05/msg00043.html
Credits
Randell Jesup