{ "document": { "aggregate_severity": { "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" }, { "category": "details", "text": "* SECURITY UPDATE: TLS close_notify use-after-free during active BDAT/CHUNKING\n transfer that can lead to unauthenticated remote code execution\n - debian/patches/CVE-2026-45185.patch: introduce tls_close_notify() that\n pops the BDAT receive layer, reinstalls plaintext receive callbacks via\n a new smtp_rcv_cleartext() helper, then re-pushes the BDAT layer before\n closing the TLS channel; switch the GnuTLS and OpenSSL receive paths\n from a bare tls_close() to tls_close_notify()\n - CVE-2026-45185", "title": "Details" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1781269872", "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1781269872" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu20.04els/advisories/2026/clsa-2026_1781269872.json" } ], "tracking": { "current_release_date": "2026-06-12T13:18:08Z", "generator": { "date": "2026-06-12T13:18:08Z", "engine": { "name": "pyCSAF" } }, "id": "CLSA-2026:1781269872", "initial_release_date": "2026-06-12T13:18:08Z", "revision_history": [ { "date": "2026-06-12T13:18:08Z", "number": "1", "summary": "Initial version" } ], "status": "final", "version": "1" }, "title": "Fix CVE(s): CVE-2026-45185" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Ubuntu 20.04", "product": { "name": "Ubuntu 20.04", "product_id": "Ubuntu-20", "product_identification_helper": { "cpe": "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*" } } } ], "category": "product_family", "name": "Ubuntu" } ], "category": 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"eximon4-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product": { "name": "eximon4-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product_id": "eximon4-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/eximon4@4.93-13ubuntu1.12%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": "exim4-dev-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product": { "name": "exim4-dev-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product_id": "exim4-dev-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/exim4-dev@4.93-13ubuntu1.12%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": "exim4-daemon-heavy-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product": { "name": "exim4-daemon-heavy-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product_id": "exim4-daemon-heavy-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/exim4-daemon-heavy@4.93-13ubuntu1.12%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": "exim4-daemon-light-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product": { "name": "exim4-daemon-light-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product_id": "exim4-daemon-light-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/exim4-daemon-light@4.93-13ubuntu1.12%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": "exim4-base-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product": { "name": "exim4-base-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product_id": "exim4-base-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/exim4-base@4.93-13ubuntu1.12%2Btuxcare.els1?arch=amd64" } } } ], "category": "architecture", "name": "amd64" }, { "branches": [ { "category": "product_version", "name": "exim4-0:4.93-13ubuntu1.12+tuxcare.els2.all", "product": { 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}, { "category": "default_component_of", "full_product_name": { "name": "exim4-config-0:4.93-13ubuntu1.12+tuxcare.els1.all as a component of Ubuntu 20.04", "product_id": "Ubuntu-20:exim4-config-0:4.93-13ubuntu1.12+tuxcare.els1.all" }, "product_reference": "exim4-config-0:4.93-13ubuntu1.12+tuxcare.els1.all", "relates_to_product_reference": "Ubuntu-20" }, { "category": "default_component_of", "full_product_name": { "name": "exim4-0:4.93-13ubuntu1.12+tuxcare.els1.all as a component of Ubuntu 20.04", "product_id": "Ubuntu-20:exim4-0:4.93-13ubuntu1.12+tuxcare.els1.all" }, "product_reference": "exim4-0:4.93-13ubuntu1.12+tuxcare.els1.all", "relates_to_product_reference": "Ubuntu-20" }, { "category": "default_component_of", "full_product_name": { "name": "exim4-daemon-light-0:4.93-13ubuntu1.12+tuxcare.els1.amd64 as a component of Ubuntu 20.04", "product_id": "Ubuntu-20:exim4-daemon-light-0:4.93-13ubuntu1.12+tuxcare.els1.amd64" }, "product_reference": "exim4-daemon-light-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-20" }, { "category": "default_component_of", "full_product_name": { "name": "exim4-base-0:4.93-13ubuntu1.12+tuxcare.els1.amd64 as a component of Ubuntu 20.04", "product_id": "Ubuntu-20:exim4-base-0:4.93-13ubuntu1.12+tuxcare.els1.amd64" }, "product_reference": "exim4-base-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-20" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-45185", "cwe": { "id": "CWE-416", "name": "Use After Free" }, "notes": [ { "category": "description", "text": "Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body parsing path. It is triggered when a client sends a TLS close_notify mid-body during a CHUNKING transfer, followed by a final cleartext byte on the same TCP connection. This can lead to heap corruption. An unauthenticated network attacker exploiting this vulnerability could execute arbitrary code.", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "Ubuntu-20:exim4-0:4.93-13ubuntu1.12+tuxcare.els2.all", "Ubuntu-20:exim4-base-0:4.93-13ubuntu1.12+tuxcare.els2.amd64", "Ubuntu-20:exim4-config-0:4.93-13ubuntu1.12+tuxcare.els2.all", "Ubuntu-20:exim4-daemon-heavy-0:4.93-13ubuntu1.12+tuxcare.els2.amd64", "Ubuntu-20:exim4-daemon-light-0:4.93-13ubuntu1.12+tuxcare.els2.amd64", "Ubuntu-20:exim4-dev-0:4.93-13ubuntu1.12+tuxcare.els2.amd64", "Ubuntu-20:eximon4-0:4.93-13ubuntu1.12+tuxcare.els2.amd64" ], "known_affected": [ "Ubuntu-20:exim4-0:4.93-13ubuntu1.12+tuxcare.els1.all", "Ubuntu-20:exim4-base-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "Ubuntu-20:exim4-config-0:4.93-13ubuntu1.12+tuxcare.els1.all", "Ubuntu-20:exim4-daemon-heavy-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "Ubuntu-20:exim4-daemon-light-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "Ubuntu-20:exim4-dev-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "Ubuntu-20:eximon4-0:4.93-13ubuntu1.12+tuxcare.els1.amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-45185" }, { "category": "external", "summary": "https://code.exim.org/exim/wiki/wiki/EximSecurity", "url": "https://code.exim.org/exim/wiki/wiki/EximSecurity" }, { "category": "external", "summary": "https://exim.org", "url": "https://exim.org/" }, { "category": "external", "summary": "https://exim.org/static/doc/security/CVE-2026-45185.txt", "url": "https://exim.org/static/doc/security/CVE-2026-45185.txt" }, { "category": "external", "summary": "https://exim.org/static/doc/security/EXIM-Security-2026-05-01.1/", "url": "https://exim.org/static/doc/security/EXIM-Security-2026-05-01.1/" }, { "category": "external", "summary": "https://news.ycombinator.com/item?id=48111748", "url": "https://news.ycombinator.com/item?id=48111748" }, { "category": "external", "summary": "https://www.openwall.com/lists/oss-security/2026/05/12/4", "url": "https://www.openwall.com/lists/oss-security/2026/05/12/4" }, { "category": "external", "summary": "https://xbow.com/blog/dead-letter-cve-2026-45185-xbow-found-rce-exim", "url": "https://xbow.com/blog/dead-letter-cve-2026-45185-xbow-found-rce-exim" }, { "category": "external", "summary": "http://www.openwall.com/lists/oss-security/2026/05/12/25", "url": "http://www.openwall.com/lists/oss-security/2026/05/12/25" } ], "release_date": "2026-05-12T20:16:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-06-12T13:11:38.639011Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1781269872", "product_ids": [ "Ubuntu-20:exim4-0:4.93-13ubuntu1.12+tuxcare.els2.all", "Ubuntu-20:exim4-base-0:4.93-13ubuntu1.12+tuxcare.els2.amd64", "Ubuntu-20:exim4-config-0:4.93-13ubuntu1.12+tuxcare.els2.all", "Ubuntu-20:exim4-daemon-heavy-0:4.93-13ubuntu1.12+tuxcare.els2.amd64", "Ubuntu-20:exim4-daemon-light-0:4.93-13ubuntu1.12+tuxcare.els2.amd64", "Ubuntu-20:exim4-dev-0:4.93-13ubuntu1.12+tuxcare.els2.amd64", "Ubuntu-20:eximon4-0:4.93-13ubuntu1.12+tuxcare.els2.amd64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1781269872" }, { "category": "none_available", "date": "2026-05-12T20:16:00Z", "details": "Affected", "product_ids": [ "Ubuntu-20:exim4-0:4.93-13ubuntu1.12+tuxcare.els1.all", "Ubuntu-20:exim4-base-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "Ubuntu-20:exim4-config-0:4.93-13ubuntu1.12+tuxcare.els1.all", "Ubuntu-20:exim4-daemon-heavy-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "Ubuntu-20:exim4-daemon-light-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "Ubuntu-20:exim4-dev-0:4.93-13ubuntu1.12+tuxcare.els1.amd64", "Ubuntu-20:eximon4-0:4.93-13ubuntu1.12+tuxcare.els1.amd64" ] } ], "threats": [ { "category": "impact", "details": "Important" } ] } ] }