{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-43964 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-43964 is a low-severity denial of service vulnerability in Postfix, published on 4 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-43964 and fix it if it is affected.\n\nWhat it is: CVE-2026-43964 is a low-severity denial of service vulnerability in Postfix, published on 4 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-43964 in the wild and no public exploit code.\n\nAffected product: Postfix. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-43964/ (Markdown: https://insights.sbomify.com/CVE-2026-43964/index.md)","id":"CVE-2026-43964","markdown":"https://insights.sbomify.com/CVE-2026-43964/index.md","name":"CVE-2026-43964","record":{"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","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","openSUSE-SU-2026:10707-1","openSUSE-SU-2026:21020-1"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Postfix mail server","requires_auth":"none","summary":"A buffer over-read in Postfix allows attackers to crash the mail server by sending a malformed enhanced status code.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"postfix","vendor":"postfix"}],"cvss":{"score":3.7,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-193","name":"Off-by-one Error"}],"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.","ecosystems":["AlmaLinux:10","AlmaLinux:8","AlmaLinux:9","Red Hat:enterprise_linux:10.2","Red Hat:enterprise_linux:8::appstream","Red Hat:enterprise_linux:8::baseos","Red Hat:enterprise_linux:9::appstream","Red Hat:enterprise_linux_eus:10.0","Red Hat:rhel_aus:8.4::baseos","Red Hat:rhel_aus:8.6::baseos","Red Hat:rhel_e4s:8.8::baseos","Red Hat:rhel_els:7","Red Hat:rhel_eus_long_life:8.4::baseos","Red Hat:rhel_eus_long_life:8.6::baseos","Red Hat:rhel_tus:8.8::baseos","Rocky Linux:10","Rocky Linux:8","Rocky Linux:9","SUSE:Linux Enterprise Module for Basesystem 15 SP7","SUSE:Linux Enterprise Module for Legacy 15 SP7","SUSE:Linux Enterprise Module for Server Applications 15 SP7","SUSE:Linux Enterprise Server 16.0","SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5","SUSE:Linux Enterprise Server for SAP applications 16.0","openSUSE:Leap 16.0","openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Denial of service in Postfix","id":"CVE-2026-43964","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":108,"n_references":1,"next":{"headline":"Path Traversal in build/packages/packages.toml Allows Arbitrary Directory Deletion","id":"CVE-2026-43965"},"packages":[{"ecosystem":"AlmaLinux:10","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix","purl":"pkg:rpm/almalinux/postfix","source":"ALSA-2026:25930"},{"ecosystem":"AlmaLinux:10","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-cdb","purl":"pkg:rpm/almalinux/postfix-cdb","source":"ALSA-2026:25930"},{"ecosystem":"AlmaLinux:10","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-ldap","purl":"pkg:rpm/almalinux/postfix-ldap","source":"ALSA-2026:25930"},{"ecosystem":"AlmaLinux:10","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-lmdb","purl":"pkg:rpm/almalinux/postfix-lmdb","source":"ALSA-2026:25930"},{"ecosystem":"AlmaLinux:10","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-mysql","purl":"pkg:rpm/almalinux/postfix-mysql","source":"ALSA-2026:25930"},{"ecosystem":"AlmaLinux:10","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-pcre","purl":"pkg:rpm/almalinux/postfix-pcre","source":"ALSA-2026:25930"},{"ecosystem":"AlmaLinux:10","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-perl-scripts","purl":"pkg:rpm/almalinux/postfix-perl-scripts","source":"ALSA-2026:25930"},{"ecosystem":"AlmaLinux:10","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-pgsql","purl":"pkg:rpm/almalinux/postfix-pgsql","source":"ALSA-2026:25930"},{"ecosystem":"AlmaLinux:10","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-sqlite","purl":"pkg:rpm/almalinux/postfix-sqlite","source":"ALSA-2026:25930"},{"ecosystem":"AlmaLinux:8","fixed":["2:3.5.8-8.el8_10"],"introduced":["0"],"last_affected":[],"package":"postfix","purl":"pkg:rpm/almalinux/postfix","source":"ALSA-2026:25932"},{"ecosystem":"AlmaLinux:8","fixed":["2:3.5.8-8.el8_10"],"introduced":["0"],"last_affected":[],"package":"postfix-cdb","purl":"pkg:rpm/almalinux/postfix-cdb","source":"ALSA-2026:25932"},{"ecosystem":"AlmaLinux:8","fixed":["2:3.5.8-8.el8_10"],"introduced":["0"],"last_affected":[],"package":"postfix-ldap","purl":"pkg:rpm/almalinux/postfix-ldap","source":"ALSA-2026:25932"},{"ecosystem":"AlmaLinux:8","fixed":["2:3.5.8-8.el8_10"],"introduced":["0"],"last_affected":[],"package":"postfix-mysql","purl":"pkg:rpm/almalinux/postfix-mysql","source":"ALSA-2026:25932"},{"ecosystem":"AlmaLinux:8","fixed":["2:3.5.8-8.el8_10"],"introduced":["0"],"last_affected":[],"package":"postfix-pcre","purl":"pkg:rpm/almalinux/postfix-pcre","source":"ALSA-2026:25932"},{"ecosystem":"AlmaLinux:8","fixed":["2:3.5.8-8.el8_10"],"introduced":["0"],"last_affected":[],"package":"postfix-perl-scripts","purl":"pkg:rpm/almalinux/postfix-perl-scripts","source":"ALSA-2026:25932"},{"ecosystem":"AlmaLinux:8","fixed":["2:3.5.8-8.el8_10"],"introduced":["0"],"last_affected":[],"package":"postfix-pgsql","purl":"pkg:rpm/almalinux/postfix-pgsql","source":"ALSA-2026:25932"},{"ecosystem":"AlmaLinux:8","fixed":["2:3.5.8-8.el8_10"],"introduced":["0"],"last_affected":[],"package":"postfix-sqlite","purl":"pkg:rpm/almalinux/postfix-sqlite","source":"ALSA-2026:25932"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-3.el9_8"],"introduced":["0"],"last_affected":[],"package":"postfix","purl":"pkg:rpm/almalinux/postfix","source":"ALSA-2026:26205"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-3.el9_8"],"introduced":["0"],"last_affected":[],"package":"postfix-cdb","purl":"pkg:rpm/almalinux/postfix-cdb","source":"ALSA-2026:26205"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-3.el9_8"],"introduced":["0"],"last_affected":[],"package":"postfix-ldap","purl":"pkg:rpm/almalinux/postfix-ldap","source":"ALSA-2026:26205"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-3.el9_8"],"introduced":["0"],"last_affected":[],"package":"postfix-lmdb","purl":"pkg:rpm/almalinux/postfix-lmdb","source":"ALSA-2026:26205"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-3.el9_8"],"introduced":["0"],"last_affected":[],"package":"postfix-mysql","purl":"pkg:rpm/almalinux/postfix-mysql","source":"ALSA-2026:26205"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-3.el9_8"],"introduced":["0"],"last_affected":[],"package":"postfix-pcre","purl":"pkg:rpm/almalinux/postfix-pcre","source":"ALSA-2026:26205"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-3.el9_8"],"introduced":["0"],"last_affected":[],"package":"postfix-perl-scripts","purl":"pkg:rpm/almalinux/postfix-perl-scripts","source":"ALSA-2026:26205"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-3.el9_8"],"introduced":["0"],"last_affected":[],"package":"postfix-pgsql","purl":"pkg:rpm/almalinux/postfix-pgsql","source":"ALSA-2026:26205"},{"ecosystem":"AlmaLinux:9","fixed":["2:3.5.25-3.el9_8"],"introduced":["0"],"last_affected":[],"package":"postfix-sqlite","purl":"pkg:rpm/almalinux/postfix-sqlite","source":"ALSA-2026:26205"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix","purl":"pkg:rpm/redhat/postfix","source":"RHSA-2026:25930"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-cdb","purl":"pkg:rpm/redhat/postfix-cdb","source":"RHSA-2026:25930"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-cdb-debuginfo","purl":"pkg:rpm/redhat/postfix-cdb-debuginfo","source":"RHSA-2026:25930"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-debuginfo","purl":"pkg:rpm/redhat/postfix-debuginfo","source":"RHSA-2026:25930"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-debugsource","purl":"pkg:rpm/redhat/postfix-debugsource","source":"RHSA-2026:25930"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-ldap","purl":"pkg:rpm/redhat/postfix-ldap","source":"RHSA-2026:25930"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-ldap-debuginfo","purl":"pkg:rpm/redhat/postfix-ldap-debuginfo","source":"RHSA-2026:25930"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-lmdb","purl":"pkg:rpm/redhat/postfix-lmdb","source":"RHSA-2026:25930"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-lmdb-debuginfo","purl":"pkg:rpm/redhat/postfix-lmdb-debuginfo","source":"RHSA-2026:25930"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-mysql","purl":"pkg:rpm/redhat/postfix-mysql","source":"RHSA-2026:25930"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-mysql-debuginfo","purl":"pkg:rpm/redhat/postfix-mysql-debuginfo","source":"RHSA-2026:25930"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-pcre","purl":"pkg:rpm/redhat/postfix-pcre","source":"RHSA-2026:25930"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-pcre-debuginfo","purl":"pkg:rpm/redhat/postfix-pcre-debuginfo","source":"RHSA-2026:25930"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["2:3.8.5-10.el10_2"],"introduced":["0"],"last_affected":[],"package":"postfix-perl-scripts","purl":"pkg:rpm/redhat/postfix-perl-scripts","source":"RHSA-2026:25930"}],"prev":{"headline":"Code injection in Red Hat Enterprise Linux 10","id":"CVE-2026-43961"},"products":["Postfix"],"published":"2026-05-04","related":[{"cvss_score":7.8,"headline":"Privilege escalation in n/a","id":"CVE-2017-10140","kev_date_added":null,"published":"2018-04-16"},{"cvss_score":6.9,"headline":"Path traversal in n/a","id":"CVE-2009-2939","kev_date_added":null,"published":"2009-09-21"},{"cvss_score":6.9,"headline":"Path traversal in n/a","id":"CVE-2008-4977","kev_date_added":null,"published":"2008-11-06"},{"cvss_score":6.8,"headline":"Memory corruption in n/a","id":"CVE-2011-1720","kev_date_added":null,"published":"2011-05-13"},{"cvss_score":6.8,"headline":"Security feature bypass in n/a","id":"CVE-2011-0411","kev_date_added":null,"published":"2011-03-16"},{"cvss_score":6.5,"headline":"SQL injection in n/a","id":"CVE-2012-0811","kev_date_added":null,"published":"2014-10-01"},{"cvss_score":6.2,"headline":"Privilege escalation in n/a","id":"CVE-2008-2936","kev_date_added":null,"published":"2008-08-18"}],"sources":[{"class":"attribution","licence":"MIT","name":"AlmaLinux","prefix":"ALSA"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-20","vendors":["Postfix"]},"summary":"A buffer over-read in Postfix allows attackers to crash the mail server by sending a malformed enhanced status code.","url":"https://insights.sbomify.com/CVE-2026-43964/"}