Vulnerability 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.
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2069113
- https://www.mozilla.org/security/advisories/mfsa2026-94/
- https://www.mozilla.org/security/advisories/mfsa2026-95/
- https://www.mozilla.org/security/advisories/mfsa2026-96/
FAQ
What is CVE-2026-92240?
CVE-2026-92240 is a documented vulnerability. 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 reachabl...
How severe is CVE-2026-92240?
CVSS scoring is not yet available for CVE-2026-92240. Check NVD for updates.
Is there a patch for CVE-2026-92240?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.