High severity · published Sep 29, 2026
CVE-2026-100832
Use-after-free in the Graphics: Canvas2D component
8.8
CVSS
0.2%
EPSS
No
On KEV
Description
Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 140.17, Thunderbird 153.4, Firefox ESR 115.42, and Firefox ESR 140.17.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 115.42.0; 116.0 before 140.17.0; 141.0 before 153.4.0 · source: NVD
TH
Thunderbird · Mozilla
before 140.17.0; 141.0 before 153.4.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-100832
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-100832
bugzilla.mozilla.org
https://bugzilla.mozilla.org/show_bug.cgi?id=2072467
www.mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-100/
www.mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-102/
www.mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-103/
www.mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-98/
www.mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-99/
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