CVE-2026-109721

CVE-2026-109721: vulnerability in Mozilla Firefox

Incorrect boundary conditions in the JavaScript Engine: JIT component

Published

0Vexday Risk Score

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

ssvc Track
exploitation probability
—
observed exploitation
nono source reports it
Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Affected products
Mozilla · FirefoxMozilla · Thunderbird
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References
https://bugzilla.mozilla.org/show_bug.cgi?id=2074161https://www.mozilla.org/security/advisories/mfsa2026-106/https://www.mozilla.org/security/advisories/mfsa2026-108/https://www.mozilla.org/security/advisories/mfsa2026-109/https://www.mozilla.org/security/advisories/mfsa2026-110/