CVE-2026-0878highCWE-119CWE-20

CVE-2026-0878: high-severity vulnerability in Mozilla Firefox

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component

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21Vexday Risk Score

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

ssvc Trackcvss 8epss 0.5%
Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Affected products
Mozilla · FirefoxMozilla · Thunderbird
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