All vulnerabilities
CVE-2026-100772

Thunderbird: Use-after-free in the DOM: Core & HTML component

Mozilla Thunderbird
Open in ThreatlineRecord JSON
CVSS
8.8High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.31%Chance of exploitation activity in the next 30 days, higher than 22% 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 DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.

Text from CVE List

Affected versions 6

  • Thunderbirdunaffected: 140.17 through 140.*CVE List
  • Thunderbirdunaffected: 153.4 through 153.*CVE List
  • Thunderbirdunaffected: 157CVE List
  • Firefoxunaffected: 140.17 through 140.*CVE List
  • Firefoxunaffected: 153.4 through 153.*CVE List
  • Firefoxunaffected: 157CVE List

References 7