VulnerabilityModified

CVE-2026-4725

Sandbox escape due to use-after-free in the Graphics: Canvas2D component.

CRITICAL 10.0EPSS 0.33%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.33%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

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

CVSS 3.1: 10.0 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS: 0.33% probability · 26th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-416
Affected: mozilla/firefox
Source: security@mozilla.org

EPSS trend

EPSS 0.3% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2017108Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-20/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-23/

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.