{ "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": "CVE-2026-28387: fix use-after-free / double-free in dane_match()\n by releasing the previously stored dane->mcert with X509_free()\n instead of OPENSSL_free(); the slot is reference-bumped via\n X509_up_ref() so the matching free is X509_free()", "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-2026:1777455447", "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1777455447" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/centos8.4els/advisories/2026/clsa-2026_1777455447.json" } ], "tracking": { "current_release_date": "2026-04-29T09:38:06Z", "generator": { "date": "2026-04-29T09:38:06Z", "engine": { "name": "pyCSAF" } }, "id": "CLSA-2026:1777455447", "initial_release_date": "2026-04-29T09:38:06Z", "revision_history": [ { "date": "2026-04-29T09:38:06Z", "number": "1", "summary": "Initial version" } ], "status": "final", "version": "1" }, "title": "openssl: Fix of CVE-2026-28387" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Community Enterprise Operating System 8.4", "product": { "name": "Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4", "product_identification_helper": { "cpe": "cpe:2.3:o:centos:centos:8.4:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Community Enterprise Operating System" } ], "category": "vendor", "name": "Red Hat, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "openssl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product": { "name": "openssl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product_id": "openssl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/openssl@1.1.1g-15.el8.4.tuxcare.els19?arch=x86_64&epoch=1" } } }, { "category": "product_version", "name": "openssl-perl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product": { "name": "openssl-perl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product_id": "openssl-perl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/openssl-perl@1.1.1g-15.el8.4.tuxcare.els19?arch=x86_64&epoch=1" } } }, { "category": "product_version", "name": "openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product": { "name": "openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product_id": "openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/openssl-devel@1.1.1g-15.el8.4.tuxcare.els19?arch=x86_64&epoch=1" } } }, { "category": "product_version", "name": "openssl-static-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product": { "name": "openssl-static-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product_id": "openssl-static-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/openssl-static@1.1.1g-15.el8.4.tuxcare.els19?arch=x86_64&epoch=1" } } }, { "category": "product_version", "name": "openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product": { "name": "openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product_id": "openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/openssl-libs@1.1.1g-15.el8.4.tuxcare.els19?arch=x86_64&epoch=1" } } } ], "category": "architecture", "name": "x86_64" }, { "branches": [ { "category": "product_version", "name": "openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.i686", "product": { "name": "openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.i686", "product_id": "openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.i686", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/openssl-devel@1.1.1g-15.el8.4.tuxcare.els19?arch=i686&epoch=1" } } }, { "category": "product_version", "name": "openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.i686", "product": { "name": "openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.i686", "product_id": "openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.i686", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/openssl-libs@1.1.1g-15.el8.4.tuxcare.els19?arch=i686&epoch=1" } } } ], "category": "architecture", "name": "i686" } ], "category": "vendor", "name": "CloudLinux" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "openssl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64 as a component of Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4:openssl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64" }, "product_reference": "openssl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "relates_to_product_reference": "CentOS-8.4" }, { "category": "default_component_of", "full_product_name": { "name": "openssl-perl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64 as a component of Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4:openssl-perl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64" }, "product_reference": "openssl-perl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "relates_to_product_reference": "CentOS-8.4" }, { "category": "default_component_of", "full_product_name": { "name": "openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64 as a component of Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4:openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64" }, "product_reference": "openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "relates_to_product_reference": "CentOS-8.4" }, { "category": "default_component_of", "full_product_name": { "name": "openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.i686 as a component of Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4:openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.i686" }, "product_reference": "openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.i686", "relates_to_product_reference": "CentOS-8.4" }, { "category": "default_component_of", "full_product_name": { "name": "openssl-static-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64 as a component of Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4:openssl-static-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64" }, "product_reference": "openssl-static-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "relates_to_product_reference": "CentOS-8.4" }, { "category": "default_component_of", "full_product_name": { "name": "openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64 as a component of Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4:openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64" }, "product_reference": "openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "relates_to_product_reference": "CentOS-8.4" }, { "category": "default_component_of", "full_product_name": { "name": "openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.i686 as a component of Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4:openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.i686" }, "product_reference": "openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.i686", "relates_to_product_reference": "CentOS-8.4" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-28387", "cwe": { "id": "CWE-416", "name": "Use After Free" }, "notes": [ { "category": "description", "text": "Issue summary: An uncommon configuration of clients performing DANE TLSA-based\nserver authentication, when paired with uncommon server DANE TLSA records, may\nresult in a use-after-free and/or double-free on the client side.\n\nImpact summary: A use after free can have a range of potential consequences\nsuch as the corruption of valid data, crashes or execution of arbitrary code.\n\nHowever, the issue only affects clients that make use of TLSA records with both\nthe PKIX-TA(0/PKIX-EE(1) certificate usages and the DANE-TA(2) certificate\nusage.\n\nBy far the most common deployment of DANE is in SMTP MTAs for which RFC7672\nrecommends that clients treat as 'unusable' any TLSA records that have the PKIX\ncertificate usages. These SMTP (or other similar) clients are not vulnerable\nto this issue. Conversely, any clients that support only the PKIX usages, and\nignore the DANE-TA(2) usage are also not vulnerable.\n\nThe client would also need to be communicating with a server that publishes a\nTLSA RRset with both types of TLSA records.\n\nNo FIPS modules are affected by this issue, the problem code is outside the\nFIPS module boundary.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "CentOS-8.4:openssl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "CentOS-8.4:openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.i686", "CentOS-8.4:openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "CentOS-8.4:openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.i686", "CentOS-8.4:openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "CentOS-8.4:openssl-perl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "CentOS-8.4:openssl-static-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-28387" }, { "category": "external", "summary": "https://github.com/openssl/openssl/commit/07e727d304746edb49a98ee8f6ab00256e1f012b", "url": "https://github.com/openssl/openssl/commit/07e727d304746edb49a98ee8f6ab00256e1f012b" }, { "category": "external", "summary": "https://github.com/openssl/openssl/commit/258a8f63b26995ba357f4326da00e19e29c6acbe", "url": "https://github.com/openssl/openssl/commit/258a8f63b26995ba357f4326da00e19e29c6acbe" }, { "category": "external", "summary": "https://github.com/openssl/openssl/commit/444958deaf450aea819171f97ae69eaedede42c3", "url": "https://github.com/openssl/openssl/commit/444958deaf450aea819171f97ae69eaedede42c3" }, { "category": "external", "summary": "https://github.com/openssl/openssl/commit/7a4e08cee62a728d32e60b0de89e6764339df0a7", "url": "https://github.com/openssl/openssl/commit/7a4e08cee62a728d32e60b0de89e6764339df0a7" }, { "category": "external", "summary": "https://github.com/openssl/openssl/commit/ec03fa050b3346997ed9c5fef3d0e16ad7db8177", "url": "https://github.com/openssl/openssl/commit/ec03fa050b3346997ed9c5fef3d0e16ad7db8177" }, { "category": "external", "summary": "https://openssl-library.org/news/secadv/20260407.txt", "url": "https://openssl-library.org/news/secadv/20260407.txt" } ], "release_date": "2026-04-07T22:16:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-04-29T09:37:31.409837Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1777455447", "product_ids": [ "CentOS-8.4:openssl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "CentOS-8.4:openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.i686", "CentOS-8.4:openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "CentOS-8.4:openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.i686", "CentOS-8.4:openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "CentOS-8.4:openssl-perl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "CentOS-8.4:openssl-static-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1777455447" } ], "scores": [ { "cvss_v3": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "products": [ "CentOS-8.4:openssl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "CentOS-8.4:openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.i686", "CentOS-8.4:openssl-devel-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "CentOS-8.4:openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.i686", "CentOS-8.4:openssl-libs-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "CentOS-8.4:openssl-perl-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64", "CentOS-8.4:openssl-static-1:1.1.1g-15.el8.4.tuxcare.els19.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Important" } ] } ] }