Critical severity10.0NVD Advisory· Published Mar 24, 2026· Updated Apr 13, 2026
CVE-2026-4689
CVE-2026-4689
Description
Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
33cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 3 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <149.0
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*range: <115.34.0
- (no CPE)range: <115.34
- (no CPE)range: <149
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*+ 2 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*range: <149.0
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*range: <140.9.0
- (no CPE)range: <149
- osv-coords26 versionspkg:apk/chainguard/firefoxpkg:apk/wolfi/firefoxpkg:rpm/almalinux/firefoxpkg:rpm/almalinux/firefox-x11pkg:rpm/almalinux/thunderbirdpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.6pkg: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%2016.0pkg: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%20for%20SAP%20applications%2016.0pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5
< 149.0-r0+ 25 more
- (no CPE)range: < 149.0-r0
- (no CPE)range: < 149.0-r0
- (no CPE)range: < 140.9.0-1.el9_7.alma.1
- (no CPE)range: < 140.9.0-1.el9_7.alma.1
- (no CPE)range: < 140.9.0-1.el9_7.alma.1
- (no CPE)range: < 140.9.0-1.1
- (no CPE)range: < 140.9.0-150200.152.225.1
- (no CPE)range: < 140.9.0-160000.1.1
- (no CPE)range: < 149.0-1.1
- (no CPE)range: < 140.9.0-150200.8.263.1
- (no CPE)range: < 140.9.0-1.1
- (no CPE)range: < 140.9.0-150200.152.225.1
- (no CPE)range: < 140.9.0-150200.152.225.1
- (no CPE)range: < 140.9.0-150200.152.225.1
- (no CPE)range: < 140.9.0-150200.152.225.1
- (no CPE)range: < 140.9.0-150200.152.225.1
- (no CPE)range: < 140.9.0-112.304.2
- (no CPE)range: < 140.9.0-150200.152.225.1
- (no CPE)range: < 140.9.0-150200.152.225.1
- (no CPE)range: < 140.9.0-150200.152.225.1
- (no CPE)range: < 140.9.0-160000.1.1
- (no CPE)range: < 140.9.0-150200.152.225.1
- (no CPE)range: < 140.9.0-150200.152.225.1
- (no CPE)range: < 140.9.0-150200.152.225.1
- (no CPE)range: < 140.9.0-160000.1.1
- (no CPE)range: < 140.9.0-112.304.2
Patches
Vulnerability mechanics
References
6- www.mozilla.org/security/advisories/mfsa2026-20/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-21/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-22/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-23/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-24/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
News mentions
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