Critical severity10.0NVD Advisory· Published Feb 24, 2026· Updated Jul 15, 2026
CVE-2026-2776
CVE-2026-2776
Description
Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. 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
34cpe: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
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
- osv-coords28 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%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/opensuse/firefox-esr&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%20LTSS%20Extended%20Security%2012%20SP5pkg: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/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-r0+ 27 more
- (no CPE)range: < 140.8.0-r0
- (no CPE)range: < 140.8.0-r0
- (no CPE)range: < 140.8.0-r0
- (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: < 140.8.0-150200.152.222.1
- (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: < 140.8.0-1.1
- (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: < 140.8.0-112.301.1
- (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: < 140.8.0-150200.8.260.1
- (no CPE)range: < 140.8.0-150200.8.260.1
Patches
Vulnerability mechanics
References
34- 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
- access.redhat.com/errata/RHSA-2026:3338nvd
- access.redhat.com/errata/RHSA-2026:3339nvd
- access.redhat.com/errata/RHSA-2026:3361nvd
- access.redhat.com/errata/RHSA-2026:3491nvd
- access.redhat.com/errata/RHSA-2026:3492nvd
- access.redhat.com/errata/RHSA-2026:3493nvd
- access.redhat.com/errata/RHSA-2026:3494nvd
- access.redhat.com/errata/RHSA-2026:3495nvd
- access.redhat.com/errata/RHSA-2026:3496nvd
- access.redhat.com/errata/RHSA-2026:3497nvd
- access.redhat.com/errata/RHSA-2026:3515nvd
- access.redhat.com/errata/RHSA-2026:3516nvd
- access.redhat.com/errata/RHSA-2026:3517nvd
- access.redhat.com/errata/RHSA-2026:3976nvd
- access.redhat.com/errata/RHSA-2026:3978nvd
- access.redhat.com/errata/RHSA-2026:3979nvd
- access.redhat.com/errata/RHSA-2026:3980nvd
- access.redhat.com/errata/RHSA-2026:3981nvd
- access.redhat.com/errata/RHSA-2026:3982nvd
- access.redhat.com/errata/RHSA-2026:3983nvd
- access.redhat.com/errata/RHSA-2026:3984nvd
- access.redhat.com/errata/RHSA-2026:4022nvd
- access.redhat.com/errata/RHSA-2026:4152nvd
- access.redhat.com/errata/RHSA-2026:4260nvd
- access.redhat.com/errata/RHSA-2026:4432nvd
- access.redhat.com/security/cve/CVE-2026-2776nvd
- bugzilla.redhat.com/show_bug.cginvd
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2776.jsonnvd
News mentions
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