{ "document": { "aggregate_severity": { "text": "Critical" }, "category": "csaf_vex", "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" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/centos7els/vex/2026/cve-2026-55203-els_os-centos7els.json" } ], "tracking": { "current_release_date": "2026-10-15T17:39:50Z", "generator": { "date": "2026-10-15T17:39:50Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-55203-ELS_OS-CENTOS7ELS", "initial_release_date": "2026-06-18T17:16:00Z", "revision_history": [ { "date": "2026-06-18T17:16:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-09-29T14:59:10Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-10-15T17:39:50Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "3" }, "title": "Security update on CVE-2026-55203" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Community Enterprise Operating System 7", "product": { "name": "Community Enterprise Operating System 7", "product_id": "CentOS-7", "product_identification_helper": { "cpe": "cpe:2.3:o:centos:centos:7:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Community Enterprise Operating System" } ], "category": "vendor", "name": "Red Hat, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.i686", "product": { "name": "haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.i686", "product_id": "haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.i686", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/haproxy@1.5.18-9.el7_9.1.tuxcare.els1?arch=i686" } } } ], "category": "architecture", "name": "i686" }, { "branches": [ { "category": "product_version", "name": "haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.x86_64", "product": { "name": "haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.x86_64", "product_id": "haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/haproxy@1.5.18-9.el7_9.1.tuxcare.els1?arch=x86_64" } } } ], "category": "architecture", "name": "x86_64" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.i686 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.i686" }, "product_reference": "haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.i686", "relates_to_product_reference": "CentOS-7" }, { "category": "default_component_of", "full_product_name": { "name": "haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.x86_64 as a component of Community Enterprise Operating System 7", "product_id": "CentOS-7:haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.x86_64" }, "product_reference": "haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.x86_64", "relates_to_product_reference": "CentOS-7" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-55203", "cwe": { "id": "CWE-190", "name": "Integer Overflow or Wraparound" }, "notes": [ { "category": "description", "text": "HAProxy through 3.4.0, fixed in commit 5985276, contains an integer overflow vulnerability in the fcgi_conn structure's drl field that allows buffer misparse as new FCGI record headers. When contentLength is 65535 and paddingLength is 1 or more, the drl field wraps to 0, causing incorrect record consumption and allowing malicious FastCGI backends to desynchronize the FCGI framing parser, potentially causing request routing errors, response smuggling, or memory safety issues.", "title": "Vulnerability description" }, { "category": "other", "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.", "title": "Statement" } ], "product_status": { "known_not_affected": [ "CentOS-7:haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.i686", "CentOS-7:haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-55203" }, { "category": "external", "summary": "https://github.com/haproxy/haproxy/commit/5985276735777634d8c85f1d73bb7764aab0d6dd", "url": "https://github.com/haproxy/haproxy/commit/5985276735777634d8c85f1d73bb7764aab0d6dd" }, { "category": "external", "summary": "https://www.vulncheck.com/advisories/haproxy-integer-overflow-in-fcgi-demux-record-length-field", "url": "https://www.vulncheck.com/advisories/haproxy-integer-overflow-in-fcgi-demux-record-length-field" } ], "release_date": "2026-06-18T17:16:00Z", "threats": [ { "category": "impact", "details": "Critical" }, { "category": "impact", "date": "2026-10-15T17:35:23.739960Z", "details": "The haproxy package for CentOS 7 ELS is not affected by CVE-2026-55203. The vulnerable code is an integer overflow in the FastCGI multiplexer introduced in HAProxy 2.1, while this platform ships haproxy 1.5.18, which does not include the FastCGI mux code.", "product_ids": [ "CentOS-7:haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.i686", "CentOS-7:haproxy-0:1.5.18-9.el7_9.1.tuxcare.els1.x86_64" ] } ] } ] }