Red Hat Security AdvisoryRHSA-2026:26564
dovecot security update
Released 2026-06-17 · Red Hat rating Important · View on Red Hat →
Fixed in
- Red Hat Enterprise Linux Server (v. 7 ELS) dovecot-1:2.2.36-8.el7_9.1, dovecot-1:2.2.36-8.el7_9.1.ppc, dovecot-mysql-1:2.2.36-8.el7_9.1 +2
- Red Hat Enterprise Linux Server Optional (v. 7 ELS) dovecot-devel-1:2.2.36-8.el7_9.1
Fixes 4 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 35
Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack.
CVSS 3.1HIGH 7.4· Network · No auth · No interaction · EPSS 0.00399 · Published 2026-03-27 · Partial fix CWE-287
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
