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CVE-2026-0878 | Mondoo Vulnerability Intelligence

CVE-2026-0878

HIGH8.0

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component

Published Jan 13, 2026

Modified Yesterday

Fix available

Details

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7.

Affected Packages

Ubuntu:14.04:LTSFirefox

Fixed in:

147

Ubuntu:16.04:LTSFirefox

Fixed in:

147

Ubuntu:18.04:LTSFirefox

Fixed in:

147

Ubuntu:20.04:LTSFirefox

Fixed in:

147

Ubuntu:22.04:LTSFirefox

Fixed in:

147

Ubuntu:24.04:LTSFirefox

Fixed in:

147

Ubuntu:25.04Firefox

Fixed in:

147

Ubuntu:25.10Firefox

Fixed in:

147

Windows:10240Mozilla Firefox

Fixed in:

147

Windows:10240Mozilla Firefox ESR

Fixed in:

140.7

Windows:14393Mozilla Firefox

Fixed in:

147

Windows:14393Mozilla Firefox ESR

Fixed in:

140.7

Windows:17763Mozilla Firefox

Fixed in:

147

Windows:17763Mozilla Firefox ESR

Fixed in:

140.7

Windows:18362Mozilla Firefox

Fixed in:

147

Windows:18362Mozilla Firefox ESR

Fixed in:

140.7

Windows:18363Mozilla Firefox

Fixed in:

147

Windows:18363Mozilla Firefox ESR

Fixed in:

140.7

Windows:19041Mozilla Firefox

Fixed in:

147

Windows:19041Mozilla Firefox ESR

Fixed in:

140.7

Windows:19042Mozilla Firefox

Fixed in:

147

Windows:19042Mozilla Firefox ESR

Fixed in:

140.7

Windows:19043Mozilla Firefox

Fixed in:

147

Windows:19043Mozilla Firefox ESR

Fixed in:

140.7

Windows:19044Mozilla Firefox

Fixed in:

147

Windows:19044Mozilla Firefox ESR

Fixed in:

140.7

Windows:19045Mozilla Firefox

Fixed in:

147

Windows:19045Mozilla Firefox ESR

Fixed in:

140.7

Windows:20348Mozilla Firefox

Fixed in:

147

Windows:20348Mozilla Firefox ESR

Fixed in:

140.7

Windows:22000Mozilla Firefox

Fixed in:

147

Windows:22000Mozilla Firefox ESR

Fixed in:

140.7

Windows:22621Mozilla Firefox

Fixed in:

147

Windows:22621Mozilla Firefox ESR

Fixed in:

140.7

Windows:22631Mozilla Firefox

Fixed in:

147

Windows:22631Mozilla Firefox ESR

Fixed in:

140.7

Windows:25398Mozilla Firefox

Fixed in:

147

Windows:25398Mozilla Firefox ESR

Fixed in:

140.7

Windows:26100Mozilla Firefox

Fixed in:

147

Windows:26100Mozilla Firefox ESR

Fixed in:

140.7

Windows:26200Mozilla Firefox

Fixed in:

147

Windows:26200Mozilla Firefox ESR

Fixed in:

140.7

macOS:14Firefox

Fixed in:

147

macOS:14Firefox ESR

Fixed in:

140.7

macOS:15Firefox

Fixed in:

147

macOS:15Firefox ESR

Fixed in:

140.7

macOS:26Firefox

Fixed in:

147

macOS:26Firefox ESR

Fixed in:

140.7

References

WEBhttps://bugzilla.mozilla.org/show_bug.cgi?id=2003989 ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2026-0878 WEBhttps://www.mozilla.org/security/advisories/mfsa2026-01/WEBhttps://www.mozilla.org/security/advisories/mfsa2026-03/

CVSS Analysis

CVSS v3.1

8.0

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

HighAC:H

Privileges Required

NonePR:N

User Interaction

RequiredUI:R

Scope

Scope

ChangedS:C

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

NoneA:N

8/CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

Timeline

PublishedJan 13, 2026

ModifiedJan 13, 2026