CVE catalog

CVE-2026-110247

Severity: High · CVSS 8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: Oct 13, 2026, 6:08:37 PM UTC
Updated: Oct 13, 2026, 7:30:29 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.17% · Oct 25, 2026

Several buffer-growth sites in libmime performed size arithmetic in 32-bit types without overflow checks. On a sufficiently large message the growth guard could fail open, or the buffer could be reallocated smaller than required, and a subsequent memcpy would then write attacker-controlled data across adjacent heap allocations. This vulnerability was fixed in Thunderbird 158.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	thunderbird	sid	`1:153.5.1esr-1`	not affected
Debian	thunderbird	forky	`1:153.5.0esr-1`	not affected
Debian	thunderbird	trixie	`1:140.12.0esr-1~deb13u1`	not affected
Debian	thunderbird	trixie-security	`1:153.5.1esr-1~deb13u2`	not affected
Debian	thunderbird	bookworm	`1:140.12.0esr-1~deb12u1`	not affected
Debian	thunderbird	bookworm-security	`1:153.5.1esr-1~deb12u1`	not affected
Ubuntu	thunderbird	22.04	`1:91.1.2+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	22.04	`1:91.3.0+build2-0ubuntu1`	vulnerable
Ubuntu	thunderbird	22.04	`1:91.3.1+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	22.04	`1:91.3.2+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	22.04	`1:91.4.0+build1.1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	22.04	`1:91.4.0+build2-0ubuntu1`	vulnerable
Ubuntu	thunderbird	22.04	`1:91.5.0+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	22.04	`1:91.5.1+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	22.04	`1:91.6.1+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	22.04	`1:91.7.0+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	22.04	`1:91.7.0+build2-0ubuntu1`	vulnerable
Ubuntu	thunderbird	22.04	`1:91.8.0+build2-0ubuntu1`	vulnerable
Ubuntu	thunderbird	22.04	`1:91.9.1+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:91.11.0+build2-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:102.2.2+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:102.4.2+build2-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:102.7.1+build2-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:102.8.0+build2-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:102.9.0+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:102.10.0+build2-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:102.11.0+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:102.13.0+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:102.15.0+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:102.15.1+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:115.3.1+build1-0ubuntu0.22.04.2`	vulnerable
Ubuntu	thunderbird	22.04	`1:115.4.1+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:115.5.0+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:115.6.0+build2-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:115.8.1+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:115.9.0+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:115.10.1+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:115.11.0+build2-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:115.12.0+build3-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:115.13.0+build5-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:115.15.0+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:115.16.0+build2-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:115.18.0+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:128.12.0+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	22.04	`1:140.7.1+build1-0ubuntu0.22.04.1`	vulnerable
Ubuntu	thunderbird	24.04	`1:115.3.1+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	24.04	`1:115.4.1+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	24.04	`1:115.4.3+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	24.04	`1:115.5.0+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	24.04	`1:115.5.1+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	24.04	`1:115.5.2+build2-0ubuntu1`	vulnerable
Ubuntu	thunderbird	24.04	`1:115.6.0+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	24.04	`1:115.6.0+build2-0ubuntu1`	vulnerable
Ubuntu	thunderbird	24.04	`1:115.6.1+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	24.04	`1:115.8.0+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	24.04	`1:115.8.1+build1+snap2`	vulnerable
Ubuntu	thunderbird	24.04	`1:115.8.1+build1+snap3`	vulnerable
Ubuntu	thunderbird	24.04	`2:1snap1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	24.04	`2:1snap1-0ubuntu3`	vulnerable
Ubuntu	thunderbird	26.10	`2:1snap1-0ubuntu5`	vulnerable
Ubuntu	thunderbird	26.04	`2:1snap1-0ubuntu3`	vulnerable
Ubuntu	thunderbird	26.04	`2:1snap1-0ubuntu4`	vulnerable
Ubuntu	thunderbird	26.04	`2:1snap1-0ubuntu5`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	thunderbird	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	thunderbird	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	thunderbird	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	thunderbird	source	bookworm	`Not affected`	unimportant	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[thunderbird]Not affected
Details (4)
- 1:140.12.0esr-1~deb12u1 · amd64 · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · arm64 · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-af]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-all]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-ar]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-ast]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-be]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-bg]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-br]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-ca]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-cak]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-cs]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-cy]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-da]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-de]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-dsb]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-el]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-en-ca]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-en-gb]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-es-ar]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-es-es]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm

Next results

Observed: Oct 27, 2026, 7:27:38 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]