{"schema_version": "1.7.0", "id": "RLSA-2026:76763", "modified": "2026-10-07T06:15:13.741522Z", "published": "2026-10-07T06:01:37.070463Z", "upstream": ["CVE-2026-27852", "CVE-2026-33263", "CVE-2026-33605", "CVE-2026-40018", "CVE-2026-40019", "CVE-2026-42007", "CVE-2026-42391", "CVE-2026-73208"], "summary": "Important: dovecot security, bug fix, and enhancement update", "details": "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. \n\nSecurity Fix(es):\n\n* dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters (CVE-2026-42391)\n\n* dovecot: Dovecot: Authentication bypass via incorrect OAuth2 token validation (CVE-2026-73208)\n\n* dovecot: Dovecot: Denial of service via crafted email headers (CVE-2026-27852)\n\n* dovecot: Dovecot: Denial of Service via truncated quoted argument in ManageSieve (CVE-2026-40019)\n\n* dovecot: Dovecot: Denial of Service and potential message duplication via connection limit exhaustion (CVE-2026-33263)\n\n* dovecot: Dovecot: Denial of Service in ManageSieve login process (CVE-2026-33605)\n\n* dovecot: Dovecot: Arbitrary Code Execution via Sieve editheader use-after-free (CVE-2026-42007)\n\n* dovecot: Dovecot: MySQL multi-byte escaping wrong (CVE-2026-40018)\n\nBug Fix(es) and Enhancement(s):\n\n* Dovecot crashes when accessing mailbox with: \"Panic: file mail-user.c: line 229 (mail_user_deinit): assertion failed: ((*user)->refcount == 1)\" (JIRA:Rocky Linux-176273)\n\nFor 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.", "severity": [{"type": "CVSS_V3", "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H"}], "affected": [{"package": {"ecosystem": "Rocky Linux:8", "name": "dovecot", "purl": "pkg:rpm/rocky-linux/dovecot?distro=rocky-linux-8&epoch=1"}, "ranges": [{"type": "ECOSYSTEM", "events": [{"introduced": "0"}, {"fixed": "1:2.3.16-16.el8_10"}], "database_specific": {"yum_repository": "AppStream"}}]}], "references": [{"type": "ADVISORY", "url": "https://errata.rockylinux.org/RLSA-2026:76763"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525545"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525547"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525557"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525559"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525567"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525576"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525583"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525584"}, {"type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:76763"}], "credits": [{"name": "Rocky Enterprise Software Foundation"}, {"name": "Red Hat"}], "database_specific": {"license": "CC-BY-4.0", "license_url": "https://creativecommons.org/licenses/by/4.0/", "source_advisory": "RHSA-2026:76763"}}