Critical severity9.8NVD Advisory· Published Mar 24, 2026· Updated Apr 13, 2026
CVE-2026-4723
CVE-2026-4723
Description
Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
6cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <149.0
- (no CPE)range: <149
- Range: <149
- osv-coords3 versionspkg:apk/chainguard/firefoxpkg:apk/wolfi/firefoxpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweed
< 149.0-r0+ 2 more
- (no CPE)range: < 149.0-r0
- (no CPE)range: < 149.0-r0
- (no CPE)range: < 149.0-1.1
Patches
Vulnerability mechanics
References
3- www.mozilla.org/security/advisories/mfsa2026-20/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
- www.mozilla.org/security/advisories/mfsa2026-23/nvd
News mentions
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