CVE-2025-26696

Publication date 10 March 2025

Last updated 13 May 2026

Ubuntu priority

Cvss 3 Severity Score

Description

Certain crafted MIME email messages that claimed to contain an encrypted OpenPGP message, which instead contained an OpenPGP signed message, were wrongly shown as being encrypted. This vulnerability was fixed in Thunderbird 136 and Thunderbird 128.8.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
thunderbird	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	22.04 LTS jammy	Fixed 1:128.12.0+build1-0ubuntu0.22.04.1
	20.04 LTS focal	Not in release

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.0 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	Low
Availability impact	Low

Scores

Parameter	Value
Base score	7.0 · High
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L

References

Related Ubuntu Security Notices (USN)

USN-7663-1
Thunderbird vulnerabilities
22 July 2025