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CVE-2026-4698

Published: Mar 24, 2026

Modified: May 22, 2026

PUBLISHED

Description

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Vendor	Product	Versions
Mozilla	Firefox	unaffected `115.34 - <= 115.` unaffected `140.9 - <= 140.` unaffected `149 - <= *`
Mozilla	Thunderbird	unaffected `140.9 - <= 140.` unaffected `149 - <= `

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2020906

https://www.mozilla.org/security/advisories/mfsa2026-20/

https://www.mozilla.org/security/advisories/mfsa2026-21/

https://www.mozilla.org/security/advisories/mfsa2026-22/

https://www.mozilla.org/security/advisories/mfsa2026-23/

https://www.mozilla.org/security/advisories/mfsa2026-24/

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