{"id":"CVE-2024-23185","aliases":["ALPINE-CVE-2024-23185","ALSA-2024:6529","ALSA-2024:6973","AZL-48984","AZL-49027","CLSA-2025-1753987188","DEBIAN-CVE-2024-23185","DLA-3860-1","DSA-5752-1","EUVD-2024-20704","GHSA-g9m4-c8qf-67qw","MGASA-2024-0280","OESA-2024-2009","RHSA-2024:6465","RHSA-2024:6529","RHSA-2024:6973","RLSA-2024:6529","RLSA-2024:6973","SUSE-SU-2024:3118-1","SUSE-SU-2026:4139-1","UBUNTU-CVE-2024-23185","USN-6982-1","USN-7013-1","openSUSE-SU-2024:14274-1","openSUSE-SU-2025:14715-1"],"status":"published","title":"Very large headers can cause resource exhaustion when parsing message. The message-parser...","description":"Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up \"full_value\" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01295,"percentile":0.70716,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-770"],"published":"2024-08-17T16:55:51Z","modified":"2026-11-05T05:36:30Z","fixes":[{"ecosystem":"Alpine:v3.21","package":"dovecot","fixed_in":["2.3.21.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"dovecot","fixed_in":["2.3.21.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"dovecot","fixed_in":["2.3.21.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"dovecot","fixed_in":["2.3.21.1-r0"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"dovecot","fixed_in":["1:2.3.16-8.el9.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"dovecot-devel","fixed_in":["1:2.3.16-8.el9.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"dovecot-mysql","fixed_in":["1:2.3.16-8.el9.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"dovecot-pgsql","fixed_in":["1:2.3.16-8.el9.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"dovecot-pigeonhole","fixed_in":["1:2.3.16-8.el9.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"dovecot","fixed_in":["1:2.3.19.1+dfsg1-2.1+deb12u1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"dovecot","fixed_in":["1:2.3.21.1+dfsg1-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"dovecot","fixed_in":["1:2.3.21.1+dfsg1-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"dovecot","fixed_in":["1:2.3.7.2-1ubuntu3.7"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"dovecot","fixed_in":["1:2.3.16+dfsg1-3ubuntu2.4"],"sources":["osv"]},{"ecosystem":"Ubuntu:24.04:LTS","package":"dovecot","fixed_in":["1:2.3.21+dfsg1-2ubuntu6"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.21","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.21.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.21.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.21.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.21.1-r0"}]}]},{"source":"osv","ecosystem":"AlmaLinux:9","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.3.16-11.el9_4.1"}]}],"bundled":2},{"source":"osv","ecosystem":"AlmaLinux:9","package":"dovecot-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.3.16-11.el9_4.1"}]}],"bundled":2},{"source":"osv","ecosystem":"AlmaLinux:9","package":"dovecot-mysql","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.3.16-11.el9_4.1"}]}],"bundled":2},{"source":"osv","ecosystem":"AlmaLinux:9","package":"dovecot-pgsql","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.3.16-11.el9_4.1"}]}],"bundled":2},{"source":"osv","ecosystem":"AlmaLinux:9","package":"dovecot-pigeonhole","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.3.16-11.el9_4.1"}]}],"bundled":2},{"source":"osv","ecosystem":"AlmaLinux:8","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.3.16-6.el8_10"}]}],"bundled":2},{"source":"osv","ecosystem":"AlmaLinux:8","package":"dovecot-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.3.16-6.el8_10"}]}],"bundled":2},{"source":"osv","ecosystem":"AlmaLinux:8","package":"dovecot-mysql","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.3.16-6.el8_10"}]}],"bundled":2},{"source":"osv","ecosystem":"AlmaLinux:8","package":"dovecot-pgsql","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.3.16-6.el8_10"}]}],"bundled":2},{"source":"osv","ecosystem":"AlmaLinux:8","package":"dovecot-pigeonhole","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.3.16-6.el8_10"}]}],"bundled":2},{"source":"osv","ecosystem":"Azure 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rt"]},{"url":"https://bugzilla.suse.com/1276827","tags":["report"]},{"url":"https://bugzilla.suse.com/1276828","tags":["report"]},{"url":"https://bugzilla.suse.com/1276830","tags":["report"]},{"url":"https://bugzilla.suse.com/1276833","tags":["report"]},{"url":"https://bugzilla.suse.com/1276835","tags":["report"]},{"url":"https://bugzilla.suse.com/1276837","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2025-59028","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-59031","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-59032","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-27852","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-27855","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-27856","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-27857","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-27858","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-27859","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-33263","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-33603","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-33604","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-33605","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-33606","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-33607","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-40014","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-40015","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-40016","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-40019","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-40020","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-40203","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-40205","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-42006","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-42007","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-42008","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-42391","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-42393","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-42395","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-52681","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-52687","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73208","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73209","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2024-23185","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2024/08/15/4","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-6982-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-7013-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2024-23184","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/KZSDCZ5LA6IHY7KXVSL6ULAJVP6OFT2M/","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2017-14461","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-15130","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-15132","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-10691","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-11494","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-11499","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-11500","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-19722","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-3814","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-7524","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-10957","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-10958","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-10967","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-12100","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-12673","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-12674","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-24386","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28200","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-7046","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-7957","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29157","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-33515","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2024-23185","description":"Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up \"full_value\" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.","status":"published","published":"2024-09-10T14:38:50.523Z","modified":"2025-11-04T16:11:13.766Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:34:05.444281Z"}],"euvd":[{"id":"EUVD-2024-20704","description":"Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up \"full_value\" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.","status":"published","published":"2024-09-10T14:38:50Z","modified":"2025-11-04T16:11:13Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T19:49:28.888576Z"}],"ghsa":[{"id":"GHSA-g9m4-c8qf-67qw","title":"Very large headers can cause resource exhaustion when parsing message. The message-parser...","description":"Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up \"full_value\" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.","status":"published","published":"2024-09-10T15:31:04Z","modified":"2025-11-04T18:31:19Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:04:33.911399Z"}],"nvd":[{"id":"CVE-2024-23185","description":"Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up \"full_value\" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.","status":"published","published":"2024-09-10T15:15:14.967Z","modified":"2026-06-17T07:12:15.523Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:10:25.561537Z"}],"osv":[{"id":"ALPINE-CVE-2024-23185","description":"Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up \"full_value\" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.","status":"published","published":"2024-09-10T15:15:14.967Z","modified":"2026-11-02T11:17:50.07320868Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:49.709457Z"},{"id":"DEBIAN-CVE-2024-23185","description":"Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up \"full_value\" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.","status":"published","published":"2024-09-10T15:15:14.967Z","modified":"2026-11-02T12:00:47.180334542Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:41.849198Z"},{"id":"OESA-2024-2009","title":"dovecot security update","description":"Dovecot is an IMAP server for Linux/UNIX-like systemsa wrapper package that will just handle common things for all versioned dovecot packages.\n\nSecurity Fix(es):\n\n(CVE-2024-23184)\n\n(CVE-2024-23185)","status":"published","published":"2024-08-23T11:07:29Z","modified":"2026-08-18T01:18:33.530449703Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:41.595342Z"},{"id":"RHSA-2024:6465","title":"Red Hat Security Advisory: dovecot security update","status":"published","published":"2024-09-24T08:42:49Z","modified":"2026-06-26T12:22:39.649986423Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:53:14.610978Z"},{"id":"RHSA-2024:6529","title":"Red Hat Security Advisory: dovecot security update","status":"published","published":"2024-09-24T08:42:59Z","modified":"2026-06-26T12:22:39.442340458Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:53:14.610978Z"},{"id":"RHSA-2024:6973","title":"Red Hat Security Advisory: dovecot security update","status":"published","published":"2024-09-24T09:22:54Z","modified":"2026-06-26T12:22:32.679891885Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:53:14.610978Z"},{"id":"UBUNTU-CVE-2024-23185","description":"Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up \"full_value\" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.","status":"published","published":"2024-08-24T00:00:00Z","modified":"2026-04-22T14:39:59.387298Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:54:42.68848Z"},{"id":"ALSA-2024:6529","title":"Moderate: dovecot security update","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. \n\nSecurity Fix(es):\n\n* dovecot: using a large number of address headers may trigger a denial of service (CVE-2024-23184)\n* dovecot: very large headers can cause resource exhaustion when parsing message (CVE-2024-23185)\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.","status":"published","published":"2024-09-10T00:00:00Z","modified":"2026-10-29T11:32:04.737944289Z","updated_at":"2026-11-02T15:27:53.030731Z"},{"id":"ALSA-2024:6973","title":"Moderate: dovecot security update","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. \n\nSecurity Fix(es):\n\n* dovecot: using a large number of address headers may trigger a denial of service (CVE-2024-23184)\n* dovecot: very large headers can cause resource exhaustion when parsing message (CVE-2024-23185)\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.","status":"published","published":"2024-09-24T00:00:00Z","modified":"2026-10-29T11:02:21.952990381Z","updated_at":"2026-11-02T15:27:53.030731Z"},{"id":"AZL-48984","title":"CVE-2024-23185 affecting package dovecot 2.3.20-1","description":"Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up \"full_value\" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.","status":"published","published":"2024-09-10T15:15:14Z","modified":"2026-04-21T04:29:42.734416Z","updated_at":"2026-11-02T15:28:06.032783Z"},{"id":"AZL-49027","title":"CVE-2024-23185 affecting package dovecot 2.3.20-1","description":"Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up \"full_value\" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.","status":"published","published":"2024-09-10T15:15:14Z","modified":"2026-11-05T05:36:30Z","updated_at":"2026-11-05T16:41:20.514083Z"},{"id":"CLSA-2025-1753987188","title":"dovecot: Fix of CVE-2024-23185","description":"- CVE-2024-23185: fix resource exhaustion caused by very large headers when\n  parsing messages","status":"published","published":"2025-07-31T18:39:52Z","modified":"2026-06-01T00:30:46.420239467Z","updated_at":"2026-11-02T15:43:42.025438Z"},{"id":"CVE-2024-23185","description":"Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up \"full_value\" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.","status":"published","published":"2024-09-10T15:15:14Z","modified":"2026-09-28T18:26:42.106419921Z","updated_at":"2026-11-02T15:44:38.577405Z"},{"id":"DLA-3860-1","title":"dovecot - security update","status":"published","published":"2024-09-02T00:00:00Z","modified":"2026-03-09T01:22:05.853224Z","updated_at":"2026-11-02T15:46:12.203458Z"},{"id":"DSA-5752-1","title":"dovecot - security update","status":"published","published":"2024-08-21T00:00:00Z","modified":"2026-03-09T02:09:45.915546Z","updated_at":"2026-11-02T15:46:17.892347Z"},{"id":"MGASA-2024-0280","title":"Updated packages fix security vulnerabilities","description":"CVE-2024-23184: A large number of address headers in email resulted in\nexcessive CPU usage.\nCVE-2024-23185: Abnormally large email headers are now truncated or\ndiscarded, with a limit of 10MB on a single header and 50MB for all the\nheaders of all the parts of an email.\n","status":"published","published":"2024-08-17T16:55:51Z","modified":"2026-04-16T04:43:33.065036066Z","updated_at":"2026-11-02T15:49:42.684501Z"},{"id":"openSUSE-SU-2024:14274-1","title":"dovecot23-2.3.21.1-1.1 on GA media","description":"These are all security issues fixed in the dovecot23-2.3.21.1-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-08-20T00:00:00Z","modified":"2026-02-04T03:25:34.190926Z","updated_at":"2026-11-02T16:58:36.662953Z"},{"id":"openSUSE-SU-2025:14715-1","title":"dovecot24-2.4.0-1.1 on GA media","description":"These are all security issues fixed in the dovecot24-2.4.0-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2025-01-30T00:00:00Z","modified":"2026-02-04T03:33:59.818366Z","updated_at":"2026-11-02T16:58:36.976155Z"},{"id":"RLSA-2024:6529","title":"Moderate: dovecot security update","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. \n\nSecurity Fix(es):\n\n* dovecot: using a large number of address headers may trigger a denial of service (CVE-2024-23184)\n\n* dovecot: very large headers can cause resource exhaustion when parsing message (CVE-2024-23185)\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.","status":"published","published":"2024-09-17T00:55:55.661497Z","modified":"2026-02-04T09:45:06.503133Z","updated_at":"2026-11-02T15:53:24.923365Z"},{"id":"RLSA-2024:6973","title":"Moderate: dovecot security update","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. \n\nSecurity Fix(es):\n\n* dovecot: using a large number of address headers may trigger a denial of service (CVE-2024-23184)\n\n* dovecot: very large headers can cause resource exhaustion when parsing message (CVE-2024-23185)\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.","status":"published","published":"2024-09-30T14:30:36.675668Z","modified":"2026-02-05T14:30:05.665486Z","updated_at":"2026-11-02T15:53:24.923365Z"},{"id":"SUSE-SU-2024:3118-1","title":"Security update for dovecot23","description":"This update for dovecot23 fixes the following issues:\n\n- CVE-2024-23185: Fixed a denial of service with large headers (bsc#1229183)\n- CVE-2024-23184: Fixed a denial of service parsing messages containing many address headers (bsc#1229184)\n","status":"published","published":"2024-09-03T15:08:50Z","modified":"2026-02-04T02:31:29.751848Z","updated_at":"2026-11-02T15:53:55.136363Z"},{"id":"SUSE-SU-2026:4139-1","title":"Security update for dovecot23","description":"This update for dovecot23 fixes the following issues:\n\n- CVE-2024-23184: parsing of messages containing many address headers (From, To, Cc, Bcc, etc.) could be excessively CPU\n  intensive (bsc#1229184).\n- CVE-2024-23185: large headers can cause resource exhaustion when parsing message (bsc#1229183).\n- CVE-2025-59028: Invalid base64 authentication can cause DoS for other logins (bsc#1260894).\n- CVE-2025-59031: decode2text.sh OOXML extraction may follow symlinks and read unintended files during indexing\n  (bsc#1260895).\n- CVE-2025-59032: pigeonhole: ManageSieve panic occurs with sieve-connect as a client (bsc#1260902).\n- CVE-2026-27852: DoS by sending mail with bad header (bsc#1276799).\n- CVE-2026-27855: OTP driver vulnerable to replay attack (bsc#1260900).\n- CVE-2026-27856: Doveadm credentials were not checked using timing-safe checking function (bsc#1260899).\n- CVE-2026-27857: sending excessive parenthesis causes imap-login to use excessive memory (bsc#1260898).\n- CVE-2026-27858: pigeonhole: managesieve-login can allocate large amount of memory during authentication (bsc#1260901).\n- CVE-2026-27859: excessive RFC 2231 MIME parameters in email would can excessive CPU usage (bsc#1260897).\n- CVE-2026-33263: submission-login: Panic when mail_max_userip_connections is reached (bsc#1276794).\n- CVE-2026-33603: login: base64 input can contain tabs that bypass IPC protection (bsc#1265147).\n- CVE-2026-33604: SMTP Smuggling via Missing Dot-Stuffing (bsc#1276802).\n- CVE-2026-33605: managesieve-login: Pre-auth crash (bsc#1276809).\n- CVE-2026-33606: dsync: Mail content can cause dsync protocol injection (bsc#1276800).\n- CVE-2026-33607: IMAP LIST match_sub() Exponential Backtracking -- CPU Denial of Service (bsc#1276795).\n- CVE-2026-40014: CPU DoS via Crafted References Header (bsc#1276804).\n- CVE-2026-40015: imap-hibernate can be crashed (bsc#1276812).\n- CVE-2026-40016: Sieve :contains/:matches O(NxM) substring match bypasses sieve_max_cpu_time limit (bsc#1265148).\n- CVE-2026-40019: managesieve-login pre-auth infinite loop (bsc#1276811).\n- CVE-2026-40020: IMAP folders can be shared-spammed to everyone (bsc#1265149).\n- CVE-2026-40203: IMAP Compression Can Reveal Whether a Small Synced Email Body Matches Sender-Chosen Text\n  (bsc#1276815).\n- CVE-2026-40205: OAuth2 passdb scope enforcement bypass via OR semantics in remote validation path (bsc#1276820).\n- CVE-2026-42006: imap-login: uncontrolled memory usage with excessive bracing over IMAP (bsc#1265150).\n- CVE-2026-42007: editheader RCE (bsc#1276817).\n- CVE-2026-42008: XCLIENT FORWARD= bare token not namespaced (bsc#1276824).\n- CVE-2026-42391: imap: Pre-login memory/CPU growth with ID command (bsc#1276835).\n- CVE-2026-42393: doveadm_password or api key length can still be leaked with timing comparisons (bsc#1276827).\n- CVE-2026-42395: Single NUL-Byte XCLIENT FORWARD Payload Crashes (bsc#1276826).\n- CVE-2026-52681: Sieve resource usage tracking lost when active script changes (bsc#1276828).\n- CVE-2026-52687: IMAP: COMPRESS ZSTD can cause excessive memory usage (bsc#1276837).\n- CVE-2026-73208: auth: db-oauth2: aud claim used as fallback for missing scope claim (bsc#1276830).\n- CVE-2026-73209: imap-login crash: Self-recursion on zero-output decompress chunks (bsc#1276833).\n\nChanges for dovecot23:\n\n- Update to version 2.3.21.1.\n","status":"published","published":"2026-09-14T07:22:32Z","modified":"2026-09-28T18:23:12.561527353Z","updated_at":"2026-11-02T15:54:05.392906Z"},{"id":"USN-6982-1","title":"dovecot vulnerabilities","description":"It was discovered that Dovecot did not not properly have restrictions on\nithe size of address headers. A remote attacker could possibly use this\nissue to cause denial of service. (CVE-2024-23184, CVE-2024-23185)\n","status":"published","published":"2024-09-02T03:31:37Z","modified":"2026-04-27T17:32:39.028106375Z","updated_at":"2026-11-02T16:58:18.876384Z"},{"id":"USN-7013-1","title":"dovecot vulnerabilities","description":"It was discovered that Dovecot incorrectly handled a large number of\naddress headers. A remote attacker could possibly use this issue to cause\nDovecot to consume resources, leading to a denial of service.\n(CVE-2024-23184)\n\nIt was discovered that Dovecot incorrectly handled very large headers. A\nremote attacker could possibly use this issue to cause Dovecot to consume\nresources, leading to a denial of service. (CVE-2024-23185)\n","status":"published","published":"2024-09-16T11:52:43Z","modified":"2026-04-27T17:32:35.844272607Z","updated_at":"2026-11-02T16:58:18.876384Z"}]}}