CVE-2025-10527 — Use After Free in Mozilla Firefox

CWE-416 — Use After Free11 documents8 sources
Severity
7.1HIGHNVD
EPSS
0.1%
top 81.58%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla ThunderbirdMozilla Firefox
Timeline
PublishedSep 16
Latest updateFeb 2

Description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:LExploitability: 2.8 | Impact: 3.7

Affected Packages3 packages

▶NVDmozilla/firefox< 140.3.0+1
▶NVDmozilla/thunderbird141.0 — 143.0+1
▶Debianmozilla/thunderbird< 1:140.3.0esr-1~deb11u1+3

🔴Vulnerability Details

3
OSV
CVE-2025-10527: Sandbox escape due to use-after-free in the Graphics: Canvas2D component↗2025-09-16
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GHSA
GHSA-5vxr-wr7m-x3p3: This vulnerability affects Firefox < 143, Firefox ESR < 140↗2025-09-16
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CVEList
Sandbox escape due to use-after-free in the Graphics: Canvas2D component↗2025-09-16
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📋Vendor Advisories

7
Ubuntu
Thunderbird vulnerabilities↗2026-02-02
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Red Hat
firefox: thunderbird: Sandbox escape due to use-after-free in the Graphics: Canvas2D component↗2025-09-16
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Debian
CVE-2025-10527: firefox - Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This v...↗2025
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Mozilla
Mozilla Foundation Security Advisory 2025-78: CVE-2025-10527↗
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Mozilla
Mozilla Foundation Security Advisory 2025-75: CVE-2025-10527↗
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CVE-2025-10527 — Use After Free in Mozilla Firefox | cvebase