CVE-2021-32055: Mutt

Critical severity, CVSS 9.1. EPSS: 2.6% chance of exploitation in the next 30 days.

Mutt 1.11.0 through 2.0.x before 2.0.7 (and NeoMutt 2019-10-25 through 2021-05-04) has a $imap_qresync issue in which imap/util.c has an out-of-bounds read in situations where an IMAP sequence set ends with a comma. NOTE: the $imap_qresync setting for QRESYNC is not enabled by default.

Affected products

• Mutt Mutt: from 1.11.0, before 2.0.7 (fixed in 2.0.7)
• Neomutt Neomutt: from 20191025, up to and including 20210504

Published 2021-05-05. Last modified 2026-06-17.