CVE-2025-10527CWE-416

CVE-2025-10527

High · published September 16, 2025

CVSS v3.1

7.1

EPSS

Percentile

19.1

In the wild

Unconfirmed

What it is

Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.

The record

Technical detail

CVSS v3.1: 7.1 · HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
CVSS v4.0: Not supplied
EPSS: 0.00277 · 19.1th percentile
Weakness: CWE-416 · Use After Free
Published: 2025-09-16T17:15Z

Affected products (4)

Product	Versions	Fixed in
mozilla/firefox	< 140.3.0	140.3.0
mozilla/firefox	≤ 143.0	—
mozilla/thunderbird	< 140.3.0	140.3.0
mozilla/thunderbird	≥ 141.0, < 143.0	143.0

References (7)

https://bugzilla.mozilla.org/show_bug.cgi?id=1984825 · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-73/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-75/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-77/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-78/ · [email protected]https://lists.debian.org/debian-lts-announce/2025/09/msg00020.html · af854a3a-2127-422b-91ae-364da2661108 https://lists.debian.org/debian-lts-announce/2025/09/msg00026.html · af854a3a-2127-422b-91ae-364da2661108

EPSS history

Timeline

16 SEP 12:26Z
Sandbox escape due to use-after-free in the Graphics: Canvas2D component
cvelistv5