All vulnerabilities
CVE-2026-100832

Firefox: Use-after-free in the Graphics: Canvas2D component

Mozilla FirefoxApplications & CMS
Open in ThreatlineRecord JSON
CVSS
8.8High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.24%Chance of exploitation activity in the next 30 days, higher than 14% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published29 Sep 2026Updated 30 Sep 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

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.

Text from CVE List

Affected versions 5

  • Firefoxunaffected: 115.42 through 115.*CVE List
  • Firefoxunaffected: 140.17 through 140.*CVE List
  • Firefoxunaffected: 153.4CVE List
  • Thunderbirdunaffected: 140.17 through 140.*CVE List
  • Thunderbirdunaffected: 153.4CVE List

References 6