{"id":"CVE-2026-43964","aliases":["ALSA-2026:25930","ALSA-2026:25932","ALSA-2026:26205","AZL-85709","CLSA-2026-1778874422","CLSA-2026-1778938383","CLSA-2026-1779095130","CLSA-2026-1779096347","CLSA-2026-1779181947","CLSA-2026-1779182686","CLSA-2026-1779183182","CLSA-2026-1779191237","CLSA-2026-1779298645","CLSA-2026-1779735114","CLSA-2026-1779735324","CLSA-2026-1788261251","DEBIAN-CVE-2026-43964","EUVD-2026-27115","GHSA-c4gx-p7gq-g6hp","MGASA-2026-0192","OESA-2026-2209","OESA-2026-2288","OESA-2026-2289","OESA-2026-2290","OESA-2026-2291","RHSA-2026:25930","RHSA-2026:25932","RHSA-2026:26205","RHSA-2026:50963","RHSA-2026:50964","RHSA-2026:51034","RHSA-2026:51436","RHSA-2026:57174","RLSA-2026:25930","RLSA-2026:25932","RLSA-2026:26205","SUSE-SU-2026:22335-1","SUSE-SU-2026:2780-1","SUSE-SU-2026:2781-1","UBUNTU-CVE-2026-43964","USN-8253-1","USN-8253-2","openSUSE-SU-2026:10707-1","openSUSE-SU-2026:21020-1"],"status":"published","title":"Postfix before 3.8.16, 3.9 before 3.9.10, and 3.10 before 3.10.9 sometimes allows a buffer over...","description":"Postfix before 3.8.16, 3.9 before 3.9.10, and 3.10 before 3.10.9 sometimes allows a buffer over-read and process crash via an enhanced status code that lacks text after the third number.","severity":{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00511,"percentile":0.43841,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-193"],"published":"2026-05-04T18:10:10Z","modified":"2026-10-29T11:32:34Z","fixes":[{"ecosystem":"AlmaLinux:10","package":"postfix","fixed_in":["2:3.8.5-10.el10_2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"postfix-cdb","fixed_in":["2:3.8.5-10.el10_2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"postfix-ldap","fixed_in":["2:3.8.5-10.el10_2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"postfix-lmdb","fixed_in":["2:3.8.5-10.el10_2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"postfix-mysql","fixed_in":["2:3.8.5-10.el10_2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"postfix-pcre","fixed_in":["2:3.8.5-10.el10_2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"postfix-perl-scripts","fixed_in":["2:3.8.5-10.el10_2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"postfix-pgsql","fixed_in":["2:3.8.5-10.el10_2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"postfix-sqlite","fixed_in":["2:3.8.5-10.el10_2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"postfix","fixed_in":["2:3.5.8-8.el8_10"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"postfix-cdb","fixed_in":["2:3.5.8-8.el8_10"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"postfix-ldap","fixed_in":["2:3.5.8-8.el8_10"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"postfix-mysql","fixed_in":["2:3.5.8-8.el8_10"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"postfix-pcre","fixed_in":["2:3.5.8-8.el8_10"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"postfix-perl-scripts","fixed_in":["2:3.5.8-8.el8_10"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"postfix-pgsql","fixed_in":["2:3.5.8-8.el8_10"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"postfix-sqlite","fixed_in":["2:3.5.8-8.el8_10"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"postfix","fixed_in":["2:3.5.25-3.el9_8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"postfix-cdb","fixed_in":["2:3.5.25-3.el9_8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"postfix-ldap","fixed_in":["2:3.5.25-3.el9_8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"postfix-lmdb","fixed_in":["2:3.5.25-3.el9_8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"postfix-mysql","fixed_in":["2:3.5.25-3.el9_8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"postfix-pcre","fixed_in":["2:3.5.25-3.el9_8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"postfix-perl-scripts","fixed_in":["2:3.5.25-3.el9_8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"postfix-pgsql","fixed_in":["2:3.5.25-3.el9_8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"postfix-sqlite","fixed_in":["2:3.5.25-3.el9_8"],"sources":["osv"]},{"ecosystem":"Azure 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number.","status":"published","published":"2026-05-05T00:00:00Z","modified":"2026-06-30T18:18:11.614871612Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"},{"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"},{"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":"2026-11-02T16:56:22.075798Z"},{"id":"ALSA-2026:25930","title":"Important: postfix security update","description":"The postfix packages provide a Mail Transport Agent (MTA), which supports protocols like LDAP, SMTP AUTH (SASL), and TLS.  \n\nSecurity Fix(es):  \n\n  * postfix: buffer over-read via malformed enhanced status code (CVE-2026-43964)\n\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 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(SASL), and TLS.  \n\nSecurity Fix(es):  \n\n  * postfix: buffer over-read via malformed enhanced status code (CVE-2026-43964)\n\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.\n","status":"published","published":"2026-06-16T00:00:00Z","modified":"2026-10-29T11:32:34.013815928Z","updated_at":"2026-11-02T15:27:54.283654Z"},{"id":"AZL-85709","title":"CVE-2026-43964 affecting package postfix for versions less than 3.9.11-1","description":"Postfix before 3.8.16, 3.9 before 3.9.10, and 3.10 before 3.10.9 sometimes allows a buffer over-read and process crash via an enhanced status code that lacks text after the third number.","status":"published","published":"2026-05-04T19:16:07Z","modified":"2026-08-28T17:56:24.256008Z","updated_at":"2026-11-02T15:28:10.677811Z"},{"id":"CLSA-2026-1778874422","title":"postfix: Fix of CVE-2026-43964","description":"- CVE-2026-43964: fix buffer over-read in dsn_split() when an enhanced\n  status code is not followed by other text","status":"published","published":"2026-05-15T22:50:09Z","modified":"2026-06-01T00:32:31.427791734Z","updated_at":"2026-11-02T15:43:44.737408Z"},{"id":"CLSA-2026-1778938383","title":"Fix CVE(s): CVE-2026-43964","description":"   * SECURITY UPDATE: Fix buffer over-read in DSN code parsing (dsn_split)\n     - debian/patches/CVE-2026-43964.patch: Fix buffer over-read in DSN code parsing (dsn_split)\n     - CVE-2026-43964","status":"published","published":"2026-05-16T14:47:27Z","modified":"2026-06-04T10:03:33.152041Z","updated_at":"2026-11-02T15:43:44.737408Z"},{"id":"CLSA-2026-1779095130","title":"postfix: Fix of CVE-2026-43964","description":"- CVE-2026-43964: fix buffer over-read in dsn_split() when an enhanced\n  status code is not followed by other text","status":"published","published":"2026-05-18T09:05:35Z","modified":"2026-06-01T00:32:01.094688174Z","updated_at":"2026-11-02T15:43:44.737408Z"},{"id":"CLSA-2026-1779096347","title":"postfix: Fix of CVE-2026-43964","description":"- CVE-2026-43964: fix buffer over-read in dsn_split() when an enhanced\n  status code is not followed by other text","status":"published","published":"2026-05-18T09:25:51Z","modified":"2026-06-01T00:33:14.704115777Z","updated_at":"2026-11-02T15:43:45.090939Z"},{"id":"CLSA-2026-1779181947","title":"postfix: Fix of CVE-2026-43964","description":"- CVE-2026-43964: fix buffer over-read on enhanced status code without trailing text","status":"published","published":"2026-05-19T09:12:31Z","modified":"2026-06-01T00:33:27.388067174Z","updated_at":"2026-11-02T15:43:45.090939Z"},{"id":"CLSA-2026-1779182686","title":"postfix: Fix of CVE-2026-43964","description":"- CVE-2026-43964: fix buffer over-read on enhanced status code without trailing text","status":"published","published":"2026-05-19T09:24:50Z","modified":"2026-06-01T00:33:28.375494858Z","updated_at":"2026-11-02T15:43:45.090939Z"},{"id":"CLSA-2026-1779183182","title":"postfix: Fix of CVE-2026-43964","description":"- CVE-2026-43964: fix buffer over-read on enhanced status code without trailing text","status":"published","published":"2026-05-21T10:28:38Z","modified":"2026-10-26T09:31:41.24700323Z","updated_at":"2026-11-02T15:43:45.090939Z"},{"id":"CLSA-2026-1779191237","title":"postfix: Fix of CVE-2026-43964","description":"- CVE-2026-43964: fix buffer over-read in dsn_split() when an enhanced\n  status code is not followed by other text","status":"published","published":"2026-05-19T11:47:21Z","modified":"2026-06-01T00:32:53.411797293Z","updated_at":"2026-11-02T15:43:45.090939Z"},{"id":"CLSA-2026-1779298645","title":"postfix: Fix of CVE-2026-43964","description":"- CVE-2026-43964: fix buffer over-read in dsn_split() when an enhanced\n  status code is not followed by other text","status":"published","published":"2026-05-20T17:37:29Z","modified":"2026-06-01T00:33:23.764440774Z","updated_at":"2026-11-02T15:43:45.090939Z"},{"id":"CLSA-2026-1779735114","title":"postfix: Fix of CVE-2026-43964","description":"- makedefs: support Linux kernel \u003e= 3 on build hosts\n- CVE-2026-43964: fix buffer over-read on enhanced status code without trailing text","status":"published","published":"2026-05-28T14:32:36Z","modified":"2026-10-26T09:31:39.36955032Z","updated_at":"2026-11-02T15:43:45.090939Z"},{"id":"CLSA-2026-1779735324","title":"postfix: Fix of CVE-2026-43964","description":"- makedefs: support Linux kernel \u003e= 3 on build hosts\n- CVE-2026-43964: fix buffer over-read on enhanced status code without trailing text","status":"published","published":"2026-05-25T18:55:28Z","modified":"2026-10-26T09:31:45.315746972Z","updated_at":"2026-11-02T15:43:45.090939Z"},{"id":"CLSA-2026-1788261251","title":"Fix CVE(s): CVE-2026-43964","description":"   * SECURITY UPDATE: buffer over-read when an enhanced status code is not\n     followed by any text\n     - debian/patches/CVE-2026-43964.patch: stop dsn_split() advancing the\n       cursor past the terminating NUL when the status code occupies the\n       whole string (upstream 4992c82ad9, postfix-3.8.16).\n     - CVE-2026-43964\n   * Recognise Linux 5 and 6 build hosts\n     - debian/patches/support-linux-5-and-6-build-hosts.patch: postfix 3.3.0\n       predates Linux 5, so makedefs aborted with \"Unknown system type\" on\n       the EL9 (5.14) build nodes before compiling anything. Widen the case\n       list and add LINUX5/LINUX6 to the existing LINUX2/3/4 sys_defs.h\n       group, so the defines match a Linux 4 host exactly.","status":"published","published":"2026-09-01T11:14:21Z","modified":"2026-10-26T09:32:03.920649219Z","updated_at":"2026-11-02T15:43:47.591214Z"},{"id":"MGASA-2026-0192","title":"Updated postfix packages fix security vulnerability","description":"Postfix before 3.8.16, 3.9 before 3.9.10, and 3.10 before 3.10.9\nsometimes allows a buffer over-read and process crash via an enhanced\nstatus code that lacks text after the third number. (CVE-2026-43964)\n","status":"published","published":"2026-06-10T17:11:15Z","modified":"2026-06-10T17:15:03.65034232Z","updated_at":"2026-11-02T15:49:43.178336Z"},{"id":"openSUSE-SU-2026:10707-1","title":"postfix-3.11.2-1.1 on GA media","description":"These are all security issues fixed in the postfix-3.11.2-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-05-06T00:00:00Z","modified":"2026-05-07T08:47:54.576973Z","updated_at":"2026-11-02T16:58:38.415593Z"},{"id":"openSUSE-SU-2026:21020-1","title":"Security update for postfix","description":"This update for postfix fixes the following issue\n\n- CVE-2026-43964: buffer overread and process crash via an enhanced status code that lacks text after the third number\n  (bsc#1264062).\n","status":"published","published":"2026-06-22T14:37:16Z","modified":"2026-06-30T18:24:37.093227922Z","updated_at":"2026-11-02T16:58:41.885092Z"},{"id":"SUSE-SU-2026:22335-1","title":"Security update for postfix","description":"This update for postfix fixes the following issue\n\n- CVE-2026-43964: buffer overread and process crash via an enhanced status code that lacks text after the third number\n  (bsc#1264062).\n","status":"published","published":"2026-06-22T14:35:39Z","modified":"2026-07-02T18:24:12.220927434Z","updated_at":"2026-11-02T15:54:03.080707Z"},{"id":"SUSE-SU-2026:2780-1","title":"Security update for postfix","description":"This update for postfix fixes the following issue\n\n\n","status":"published","published":"2026-07-06T14:11:49Z","modified":"2026-07-07T08:30:06.264971353Z","updated_at":"2026-11-02T15:54:04.987808Z"},{"id":"SUSE-SU-2026:2781-1","title":"Security update for postfix","description":"This update for postfix fixes the following issue\n\n- CVE-2026-43964: buffer overread and process crash via an enhanced status code that lacks text after the third number\n  (bsc#1264062).\n","status":"published","published":"2026-07-06T14:12:18Z","modified":"2026-07-07T08:30:06.270351041Z","updated_at":"2026-11-02T15:54:04.987808Z"},{"id":"USN-8253-1","title":"postfix vulnerability","description":"Kamil Frankowicz discovered that Postfix incorrectly handled certain\nenhanced status codes. A remote attacker could possibly use this issue to\ncause Postfix to crash, resulting in a denial of service.","status":"published","published":"2026-05-07T14:31:25Z","modified":"2026-06-30T18:15:58.753045574Z","updated_at":"2026-11-02T16:58:22.951676Z"},{"id":"USN-8253-2","title":"postfix vulnerability","description":"USN-8253-1 fixed a vulnerability in Postfix. This update provides the\ncorresponding fix for Postfix on Ubuntu 14.04 LTS, Ubuntu 16.04 LTS,\nUbuntu 18.04 LTS, and Ubuntu 20.04 LTS.\n\nOriginal advisory details:\n\n Kamil Frankowicz discovered that Postfix incorrectly handled certain\n enhanced status codes. A remote attacker could possibly use this issue to\n cause Postfix to crash, resulting in a denial of service.","status":"published","published":"2026-06-03T20:22:56Z","modified":"2026-06-30T18:15:58.908770034Z","updated_at":"2026-11-02T16:58:22.951676Z"}]}}