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High 8.0Published Jan 13, 2026
CVE-2026-0878Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component
Updated under an hour ago ()
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It affects Mozilla Firefox and 9 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.0 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
- Weakness (CWE)
- CWE-119, CWE-20
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mozilla
- NVD analysis
- Modified
- Record last updated
- Jul 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Mozilla Firefox mozilla:firefox (from the name) | 140.7 builds before 140.* not affected; from 147 not affected | CNA record |
Mozilla Thunderbird mozilla:thunderbird (from the name) | 140.7 builds before 140.* not affected; from 147 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:140.7.0-1.el10_1 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:140.7.0-1.el10_0 not affected | CISA ADP |
from 0:140.7.0-1.el7_9 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support redhat:rhel_aus | from 0:140.7.0-1.el8_2 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On redhat:rhel_eus_long_life | from 0:140.7.0-1.el8_4 not affected | CISA ADP |
from 0:140.7.0-1.el8_6 not affected | CISA ADP | |
from 0:140.7.0-1.el8_6 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support redhat:rhel_eus | from 0:140.7.0-1.el9_4 not affected | CISA ADP |
mozilla firefox mozilla:firefox | before 140.7.0; before 147.0 | NVD |
mozilla thunderbird mozilla:thunderbird | before 140.7.0; before 147.0 | NVD |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2003989permissions-required
- https://www.mozilla.org/security/advisories/mfsa2026-01/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2026-03/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2026-04/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2026-05/vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:0667
- https://access.redhat.com/errata/RHSA-2026:0694
- https://access.redhat.com/errata/RHSA-2026:0924
- https://access.redhat.com/errata/RHSA-2026:1320
- https://access.redhat.com/errata/RHSA-2026:1413
- https://access.redhat.com/errata/RHSA-2026:1414
- https://access.redhat.com/errata/RHSA-2026:1415
- https://access.redhat.com/errata/RHSA-2026:1461
- https://access.redhat.com/errata/RHSA-2026:1462
- https://access.redhat.com/errata/RHSA-2026:1471
- https://access.redhat.com/errata/RHSA-2026:1487
- https://access.redhat.com/errata/RHSA-2026:2041
- https://access.redhat.com/errata/RHSA-2026:2043
- https://access.redhat.com/errata/RHSA-2026:2044
- https://access.redhat.com/errata/RHSA-2026:2047
- https://access.redhat.com/errata/RHSA-2026:2069
- https://access.redhat.com/errata/RHSA-2026:2070
- https://access.redhat.com/errata/RHSA-2026:2073
- https://access.redhat.com/errata/RHSA-2026:2074
- https://access.redhat.com/errata/RHSA-2026:2220
The CVE record on cve.org NVD's entry
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