# CVE-2026-92240

## Summary

- **CVE ID:** CVE-2026-92240
- **Severity:** UNKNOWN
- **CVSS Score:** 0
- **CWE:** N/A
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 16, 2026

## 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 and Thunderbird 140.16.

## Affected Products

- Mozilla — Thunderbird (140.16)
- Mozilla — Thunderbird (156)
- Mozilla — Thunderbird (153.3)

## References

- [CNA](https://bugzilla.mozilla.org/show_bug.cgi?id=2069113)
- [CNA](https://www.mozilla.org/security/advisories/mfsa2026-94/)
- [CNA](https://www.mozilla.org/security/advisories/mfsa2026-95/)
- [CNA](https://www.mozilla.org/security/advisories/mfsa2026-96/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.21%
- **EPSS Percentile:** 12.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._