CVE-2026-92238

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

9.8

Vector

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

Exploitability: 3.9 / Impact: 5.9

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

Description

A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

Affected (3)

Products: Mozilla: Thunderbird

Mozilla

1 product

Thunderbird

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

CWE-444

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

References (4)

https://bugzilla.mozilla.org/show_bug.cgi?id=2060601

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.