CVE-2026-92240

Published: Sep 15, 2026Modified: Sep 24, 2026

9.1

Vector

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

Exploitability: 3.9 / Impact: 5.2

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

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.

Affected (3)

Products: Mozilla: Thunderbird

1 product

Configuration A

3 vulnerable

Vulnerable Software	Affected Versions
Mozilla Thunderbird	version < 140.16.0
Mozilla Thunderbird	141.0 ≤ version < 153.3.0
Mozilla Thunderbird	154.0 ≤ version < 156.0

Related CWEs

Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

References (4)

https://bugzilla.mozilla.org/show_bug.cgi?id=2069113

Source: security@mozilla.org

Permissions Required

https://www.mozilla.org/security/advisories/mfsa2026-94/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-95/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-96/

Source: security@mozilla.org

Vendor Advisory

Timeline

No history available yet.