CVE-2026-0878
Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component
CVSS Score
8.0
EPSS Score
0.0%
EPSS Percentile
0th
Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
| Vendor | mozilla |
| Product | firefox |
| Ecosystems | |
| Industries | Technology |
| Published | Jan 13, 2026 |
| Last Updated | Jul 15, 2026 |
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Affected Versions
Mozilla / Firefox
All versions affected Mozilla / Thunderbird
All versions affected References
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2003989 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-01/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-03/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-04/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-05/ access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-0878 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2428965 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-0878.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2231 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2271 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2286 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:0667 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2220 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2074 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:1471 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2073 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:1461 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2070 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:1487 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2069 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:1462 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2047 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:1413 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2044 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:1415 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2041 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:1414 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2043 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:1320 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:0694 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:0924
Credits
Oskar L