High severity7.5NVD Advisory· Published Apr 21, 2026· Updated Apr 22, 2026
CVE-2026-6754
CVE-2026-6754
Description
Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
13cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 2 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <150.0
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*range: <115.35.0
- (no CPE)range: <115.35,<140.10
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*+ 1 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*range: <140.10.0
- (no CPE)range: <150,<140.10
- osv-coords8 versionspkg:apk/chainguard/firefoxpkg:apk/chainguard/firefox-esrpkg:apk/wolfi/firefoxpkg:rpm/almalinux/firefoxpkg:rpm/almalinux/firefox-x11pkg:rpm/almalinux/thunderbirdpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweed
< 140.10-r0+ 7 more
- (no CPE)range: < 140.10-r0
- (no CPE)range: < 140.10.1-r0
- (no CPE)range: < 140.10-r0
- (no CPE)range: < 140.10.0-1.el9_7.alma.1
- (no CPE)range: < 140.10.0-1.el9_7.alma.1
- (no CPE)range: < 140.10.0-1.el10_1.alma.1
- (no CPE)range: < 150.0-1.1
- (no CPE)range: < 140.9.1-1.1
Patches
Vulnerability mechanics
References
6- www.mozilla.org/security/advisories/mfsa2026-30/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-31/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-32/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-33/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-34/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
News mentions
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