CVE-2025-10528highCWE-693

CVE-2025-10528: high-severity vulnerability in Mozilla Firefox

Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component

Published 16 Sep 2025 · Updated 13 Apr 2026

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.3epss 0.4%

Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

Mozilla · Firefox Mozilla · Thunderbird

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References

https://bugzilla.mozilla.org/show_bug.cgi?id=1986185 https://lists.debian.org/debian-lts-announce/2025/09/msg00020.html https://lists.debian.org/debian-lts-announce/2025/09/msg00026.html https://www.mozilla.org/security/advisories/mfsa2025-73/https://www.mozilla.org/security/advisories/mfsa2025-75/https://www.mozilla.org/security/advisories/mfsa2025-77/https://www.mozilla.org/security/advisories/mfsa2025-78/