Red Hat Product Errata RHSA-2026:46379 - Security Advisory Issued: 2026-07-27 Updated: 2026-07-27 RHSA-2026:46379 - Security Advisory Overview Updated Packages Synopsis Important: dovecot security update Type/Severity Security Advisory: Important Red Hat Lightspeed patch analysis Identify and remediate systems affected by this advisory. View affected systems Topic An update for dovecot is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. Description Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages. Security Fix(es): dovecot: Dovecot: Denial of Service via excessive IMAP bracing (CVE-2026-42006) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Solution For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Affected Products Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life 8.6 x86_64 Red Hat Enterprise Linux Server - AUS 8.6 x86_64 Fixes BZ - 2476476 - CVE-2026-42006 dovecot: Dovecot: Denial of Service via excessive IMAP bracing CVEs CVE-2026-42006 References https://access.redhat.com/security/updates/classification/#important Note: More recent versions of these packages may be available. Click a package name for more details. Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life 8.6 SRPM dovecot-2.3.16-2.el8_6.2.src.rpm SHA-256: 09868e082a9a021e2a340541ee5530d38f2b8318408e3185c277d38ebfa5cd39 x86_64 dovecot-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: de6a26548540257cfc9a8233bd7397b41fea26124d44b238cd5ef6f9a6a9fa95 dovecot-debuginfo-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: 52cad8091c02eab9f93ccb7424c6e4db44706d19e3c91932d83a06addbefed36 dovecot-debugsource-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: ad52fea74d088ec9284cb280702df2d2a72a4cad4c3996a257ccbe3e44daf0f2 dovecot-mysql-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: 33753dce527f47e83a3e3cc04a5547b4d1e9803ee662f12994974b6bac4c422b dovecot-mysql-debuginfo-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: 96cf1fdf0369bac0c27c62e157f94f6982b4f17cb5244c4bbdb448bf49758bf3 dovecot-pgsql-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: 1e7ea7053e19c791c5985d39ecb59cd7d80a50be2c6e25f7a6ea612caaf44ac2 dovecot-pgsql-debuginfo-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: b1c4e6c6613255015fb362600e79e849797a9000cd619e3699c46b7d8bc6efa2 dovecot-pigeonhole-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: 626f8ec31430ed3df7815a5c42e8093a83b3a1308c97be8ea3fb4d91be7ee464 dovecot-pigeonhole-debuginfo-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: 985993aeee6bb49bdc2f5585147e8a40ee670d9157301b05e4d79a6114f498ed Red Hat Enterprise Linux Server - AUS 8.6 SRPM dovecot-2.3.16-2.el8_6.2.src.rpm SHA-256: 09868e082a9a021e2a340541ee5530d38f2b8318408e3185c277d38ebfa5cd39 x86_64 dovecot-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: de6a26548540257cfc9a8233bd7397b41fea26124d44b238cd5ef6f9a6a9fa95 dovecot-debuginfo-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: 52cad8091c02eab9f93ccb7424c6e4db44706d19e3c91932d83a06addbefed36 dovecot-debugsource-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: ad52fea74d088ec9284cb280702df2d2a72a4cad4c3996a257ccbe3e44daf0f2 dovecot-mysql-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: 33753dce527f47e83a3e3cc04a5547b4d1e9803ee662f12994974b6bac4c422b dovecot-mysql-debuginfo-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: 96cf1fdf0369bac0c27c62e157f94f6982b4f17cb5244c4bbdb448bf49758bf3 dovecot-pgsql-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: 1e7ea7053e19c791c5985d39ecb59cd7d80a50be2c6e25f7a6ea612caaf44ac2 dovecot-pgsql-debuginfo-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: b1c4e6c6613255015fb362600e79e849797a9000cd619e3699c46b7d8bc6efa2 dovecot-pigeonhole-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: 626f8ec31430ed3df7815a5c42e8093a83b3a1308c97be8ea3fb4d91be7ee464 dovecot-pigeonhole-debuginfo-2.3.16-2.el8_6.2.x86_64.rpm SHA-256: 985993aeee6bb49bdc2f5585147e8a40ee670d9157301b05e4d79a6114f498ed The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .