Critical severity10.0NVD Advisory· Published Feb 24, 2026· Updated Apr 13, 2026
CVE-2026-2778
CVE-2026-2778
Description
Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
31cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 2 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <148.0
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*range: <115.33.0
- (no CPE)range: <148, <115.33 (ESR), <140.8 (ESR)
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*+ 2 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*range: <148.0
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*range: <140.8.0
- (no CPE)range: <148, <140.8
- osv-coords25 versionspkg: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%20Leap%2016.0pkg: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%20SP5pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP7pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP7
< 140.8.0-2.el8_10.alma.1+ 24 more
- (no CPE)range: < 140.8.0-2.el8_10.alma.1
- (no CPE)range: < 140.8.0-2.el9_7.alma.1
- (no CPE)range: < 140.8.0-1.el8_10.alma.1
- (no CPE)range: < 140.8.0-1.1
- (no CPE)range: < 140.8.0-150200.152.222.1
- (no CPE)range: < 140.8.0-160000.1.1
- (no CPE)range: < 148.0-1.1
- (no CPE)range: < 140.8.0-150200.8.260.1
- (no CPE)range: < 140.8.1-bp160.1.1
- (no CPE)range: < 140.8.0-1.1
- (no CPE)range: < 140.8.0-150200.152.222.1
- (no CPE)range: < 140.8.0-150200.152.222.1
- (no CPE)range: < 140.8.0-150200.152.222.1
- (no CPE)range: < 140.8.0-150200.152.222.1
- (no CPE)range: < 140.8.0-150200.152.222.1
- (no CPE)range: < 140.8.0-112.301.1
- (no CPE)range: < 140.8.0-150200.152.222.1
- (no CPE)range: < 140.8.0-150200.152.222.1
- (no CPE)range: < 140.8.0-150200.152.222.1
- (no CPE)range: < 140.8.0-150200.152.222.1
- (no CPE)range: < 140.8.0-150200.152.222.1
- (no CPE)range: < 140.8.0-150200.152.222.1
- (no CPE)range: < 140.8.0-112.301.1
- (no CPE)range: < 140.8.0-150200.8.260.1
- (no CPE)range: < 140.8.0-150200.8.260.1
Patches
Vulnerability mechanics
References
6- www.mozilla.org/security/advisories/mfsa2026-13/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-14/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-15/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-16/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-17/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdIssue TrackingPermissions Required
News mentions
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