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 p…
Published: 2026-09-15 · CVSS: 9.1 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7