CVE-2026-4698

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.

PUBLISHED Reserved 2026-03-23 | Published 2026-03-24 | Updated 2026-05-22 | Assigner mozilla

Product status

Credits

maxpl0it working with Trend Micro Zero Day Initiative

References

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

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

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

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

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

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

cve.org (CVE-2026-4698)

nvd.nist.gov (CVE-2026-4698)

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