Medium severity5.4NVD Advisory· Published Jun 16, 2026· Updated Jun 16, 2026
CVE-2026-12299
CVE-2026-12299
Description
JIT miscompilation in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
25cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 2 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <152.0
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*range: <115.37.0
- (no CPE)range: = 152
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*+ 2 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*range: <152.0.0
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*range: >=140.0,<140.12.0
- (no CPE)range: = 152, 140.12
- osv-coords19 versionspkg:rpm/almalinux/firefoxpkg:rpm/almalinux/firefox-x11pkg:rpm/almalinux/thunderbirdpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweedpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP7pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5
< 140.12.0-1.el8_10.alma.1+ 18 more
- (no CPE)range: < 140.12.0-1.el8_10.alma.1
- (no CPE)range: < 140.12.0-1.el9_8.alma.1
- (no CPE)range: < 140.12.0-1.el9_8.alma.1
- (no CPE)range: < 140.12.0-1.1
- (no CPE)range: < 152.0-1.1
- (no CPE)range: < 140.12.0-1.1
- (no CPE)range: < 140.12.0-150200.152.242.1
- (no CPE)range: < 140.12.0-150200.152.242.1
- (no CPE)range: < 140.12.0-150200.152.242.1
- (no CPE)range: < 140.12.0-150200.152.242.1
- (no CPE)range: < 140.12.0-150200.152.242.1
- (no CPE)range: < 140.12.0-112.321.1
- (no CPE)range: < 140.12.0-150200.152.242.1
- (no CPE)range: < 140.12.0-150200.152.242.1
- (no CPE)range: < 140.12.0-150200.152.242.1
- (no CPE)range: < 140.12.0-150200.152.242.1
- (no CPE)range: < 140.12.0-150200.152.242.1
- (no CPE)range: < 140.12.0-150200.152.242.1
- (no CPE)range: < 140.12.0-112.321.1
Patches
Vulnerability mechanics
References
6- www.mozilla.org/security/advisories/mfsa2026-57/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-58/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-59/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-60/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-61/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
News mentions
1- Multiple Vulnerabilities in Firefox 152 Enables Remote Code Execution AttacksCyber Security News · Jun 18, 2026