CVE-2026-92240

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-92240
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.

9.1 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=2069113 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-94/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-95/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-96/ Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
History

24 Sep 2026, 14:15

Type Values Removed Values Added
CPE cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
First Time Mozilla thunderbird
Mozilla
References () https://bugzilla.mozilla.org/show_bug.cgi?id=2069113 - () https://bugzilla.mozilla.org/show_bug.cgi?id=2069113 - Permissions Required
References () https://www.mozilla.org/security/advisories/mfsa2026-94/ - () https://www.mozilla.org/security/advisories/mfsa2026-94/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-95/ - () https://www.mozilla.org/security/advisories/mfsa2026-95/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-96/ - () https://www.mozilla.org/security/advisories/mfsa2026-96/ - Vendor Advisory

22 Sep 2026, 16:18

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 9.1
CWE CWE-125

16 Sep 2026, 15:19

Type Values Removed Values Added
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-96/ -
Summary (en) 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 and Thunderbird 140.16. (en) 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.
Information

Published : 2026-09-15 20:19

Updated : 2026-09-24 14:15

NVD link : CVE-2026-92240

Mitre link : CVE-2026-92240

CVE.ORG link : CVE-2026-92240

JSON object : View

Products Affected

mozilla

  • thunderbird
CWE
CWE-125

Out-of-bounds Read