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CVE PROGRAM SOURCE RECORD9.1 Critical

CVE-2026-92240

Out-of-bounds read in IMAP response parser

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mozilla Thunderbird

  • 140.16 to ≤ 140.*unaffected
  • 153.3 to ≤ 153.*unaffected
  • 156 to ≤ *unaffected

References