CVE-2026-4725

CWE-416 — Use After FreeCWE-8259 documents8 sources
Severity
10.0CRITICAL
EPSS
0.0%
top 98.22%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedMar 24

Description

Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149 and Thunderbird < 149.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HExploitability: 3.9 | Impact: 6.0

Affected Packages3 packages

▶CVEListV5mozilla/firefoxunspecified — 149
▶NVDmozilla/firefox< 149.0
▶CVEListV5mozilla/thunderbirdunspecified — 149

🔴Vulnerability Details

3
GHSA
GHSA-px39-2r97-x6x6: Sandbox escape due to use-after-free in the Graphics: Canvas2D component↗2026-03-24
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CVEList
Sandbox escape due to use-after-free in the Graphics: Canvas2D component↗2026-03-24
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OSV
CVE-2026-4725: Sandbox escape due to use-after-free in the Graphics: Canvas2D component↗2026-03-24
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📋Vendor Advisories

4
Red Hat
firefox: Sandbox escape due to use-after-free in the Graphics: Canvas2D component↗2026-03-24
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Debian
CVE-2026-4725: firefox - Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This v...↗2026
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Mozilla
Mozilla Foundation Security Advisory 2026-23: CVE-2026-4725↗
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Mozilla
Mozilla Foundation Security Advisory 2026-20: CVE-2026-4725↗
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🕵️Threat Intelligence

1
Wiz
CVE-2026-4725 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-4725 (CRITICAL CVSS 10) | Sandbox escape due to use-after-fre | cvebase.io