CVE-2026-92240
CRITICALCVSS 9.1Description
A malicious or compromised IMAP server can trigger an out-of-bounds read in the IMAP response parser by sending an untagged '* ID' response, crashing Thunderbird. The affected parsing path is reachable before authentication. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Timeline
Published:September 15th, 2026 8:19 PM
Last modified:September 24th, 2026 2:15 PM
CVSS Scoring
CVSS v3: 9.1 (CRITICAL)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Affected Software
From NVD CPE configuration data
Vendors
mozilla
Products
thunderbird
Weaknesses (CWE)
References & Reports
Advisories, patches, and third-party reports
Source: NIST NVD · Data may lag official sources by up to one minute