CVE-2026-92240 Out-of-bounds read in IMAP response parser

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...

CVE-2026-92240

A malicious or compromised IMAP server can trigger an out-of-bounds read in the IMAP response parser in Thunderbird by sending an untagged * ID response, causing the application to crash. The affected parsing path is reachable before authentication , broadening the attack surface. The vulnerabili...