VDB
CVE-2026-92240
CVE-2026-92240
PUBLISHED
CVSS 9.1 CRITICAL
Reported by mozilla · Published September 15, 2026
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.
Risk Scores
CVSS 3.1
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Thunderbird | 140.16, 153.3, 156 |
| Mozilla | Thunderbird | 140.16, 156, 153.3 |
Timeline
- Sep 15, 2026 Coalition ESS Score
- Sep 15, 2026 CVE Published
- Sep 16, 2026 EPSS Score
- Sep 17, 2026 EPSS Score
- Sep 18, 2026 EPSS Score
- Sep 23, 2026 EPSS Score
- Sep 24, 2026 EPSS Score
- Sep 24, 2026 Distribution Patch
- Sep 24, 2026 Security Advisory
- Sep 25, 2026 EPSS Score
- Sep 26, 2026 EPSS Score
- Sep 29, 2026 Distribution Patch