Description
Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Affected products
mozilla: firefox; mozilla: thunderbird
References10
- www.mozilla.org/security/advisories/mfsa2026-30/ Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-31/ Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-32/ Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-33/ Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-34/ Vendor Advisory
- bugzilla.mozilla.org/show_bug.cgi?id=2022610 Permissions Required
- access.redhat.com/errata/RHSA-2026:10757
- access.redhat.com/errata/RHSA-2026:10766
- access.redhat.com/errata/RHSA-2026:10767
- access.redhat.com/errata/RHSA-2026:12285
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - EPSS — exploit probability
- 0% percentile: 35 · as of 13 November 2026
- CWE
- CWE-908CWE-824
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.