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CVE-2026-92240 Details
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.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Sep 22, 2026Exploitation: NoneAutomatable: YesTechnical Impact: Total
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=2069113 | [email protected] | Permissions Required |
| https://www.mozilla.org/security/advisories/mfsa2026-94/ | [email protected] | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-95/ | [email protected] | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-96/ | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| mozilla thunderbird | < 140.16.0 >= 141.0, < 153.3.0 >= 154.0, < 156.0 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 24, 2026 | Initial Analysis | [email protected] |
| Sep 22, 2026 | CVE Modified | CISA-ADP |
| Sep 16, 2026 | CVE Modified | [email protected] |
| Sep 15, 2026 | New CVE Received | [email protected] |