Red Hat Security AdvisoryRHSA-2026:18053
dovecot security update
Released 2026-05-18 · Red Hat rating Important · View on Red Hat →
Fixed in
- Red Hat Enterprise Linux AppStream E4S (v.8.8) dovecot-1:2.3.16-3.el8_8.1, dovecot-mysql-1:2.3.16-3.el8_8.1, dovecot-pgsql-1:2.3.16-3.el8_8.1 +1
- Red Hat Enterprise Linux AppStream TUS (v.8.8) dovecot-1:2.3.16-3.el8_8.1, dovecot-mysql-1:2.3.16-3.el8_8.1, dovecot-pgsql-1:2.3.16-3.el8_8.1 +1
Fixes 3 records
Priority MEDIUM 40
Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory.
CVSS 3.1HIGH 7.5· Network · No auth · No interaction · EPSS 0.00804 · Published 2026-03-27 · Partial fix CWE-400
Priority MEDIUM 40
ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response.
CVSS 3.1HIGH 7.5· Network · No auth · No interaction · EPSS 0.0073 · Published 2026-03-27 · Partial fix CWE-20
Priority LOW 34
Sending "NOOP (((...)))" command with 4000 parenthesis open+close results in ~1MB extra memory usage.
CVSS 3.1HIGH 7.5· Network · No auth · No interaction · EPSS 0.00679 · Published 2026-03-27 · Partial fix CWE-400
