CVE-2025-5269

Description

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.

PUBLISHED Reserved 2025-05-27 | Published 2025-05-27 | Updated 2026-04-13 | Assigner mozilla

Product status

Credits

Randell Jesup

References

lists.debian.org/debian-lts-announce/2025/05/msg00046.html

lists.debian.org/debian-lts-announce/2025/05/msg00043.html

bugzilla.mozilla.org/show_bug.cgi?id=1924108 (Memory safety bug fixed in Firefox ESR 128.11 and Thunderbird 128.11)

www.mozilla.org/security/advisories/mfsa2025-44/

www.mozilla.org/security/advisories/mfsa2025-46/

cve.org (CVE-2025-5269)

nvd.nist.gov (CVE-2025-5269)

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