What is RHSA-2026:26564?

RHSA-2026:26564 is a security advisory published by Red Hat Product Security with High severity. Red Hat Security Advisory: dovecot security update

Which CVE IDs does RHSA-2026:26564 cover?

RHSA-2026:26564 covers the following CVE IDs: CVE-2026-27857, CVE-2026-27858, CVE-2025-59032, CVE-2026-27856. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of RHSA-2026:26564?

RHSA-2026:26564 has a CVSS v3 base score of 7.5, published by Red Hat Product Security.

RHSA-2026:26564HighCVSS 7.5

Red Hat Security Advisory: dovecot security update

Vendor

Red Hat Product Security

Published

June 17, 2026

Last Modified

June 25, 2026

🔗 CVE IDs covered (4)

CVE-2026-27857 →CVE-2026-27858 →CVE-2025-59032 →CVE-2026-27856 →

📋 Description

CVE-2025-59032 — dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command CVE-2026-27856 — dovecot: Doveadm: Full access via timing oracle attack in credential verification CVE-2026-27857 — dovecot: denial of service via specially crafted NOOP command CVE-2026-27858 — dovecot: denial of service via crafted message before authentication

🔗 References (7)

selfhttps://access.redhat.com/errata/RHSA-2026:26564
externalhttps://access.redhat.com/security/updates/classification/#important
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2452171
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2452172
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2452175
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2452179
selfhttps://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_26564.json