{
  "document": {
    "aggregate_severity": {
      "text": "Critical"
    },
    "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-2026-55203: fix integer overflow in FCGI mux demux record length field\n  by widening drl from uint16_t to uint32_t, preventing FCGI framing\n  desynchronization triggered by malicious backends",
        "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-2026:1782744931",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1782744931"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/almalinux9.2esu/advisories/2026/clsa-2026_1782744931.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-06-29T14:56:22Z",
      "generator": {
        "date": "2026-06-29T14:56:22Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1782744931",
      "initial_release_date": "2026-06-29T14:56:22Z",
      "revision_history": [
        {
          "date": "2026-06-29T14:56:22Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "haproxy: Fix of CVE-2026-55203"
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "AlmaLinux 9.2",
                "product": {
                  "name": "AlmaLinux 9.2",
                  "product_id": "AlmaLinux-9.2",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:almalinux:almalinux:9.2:*:*:*:*:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "AlmaLinux"
          }
        ],
        "category": "vendor",
        "name": "AlmaLinux OS Foundation"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "haproxy-0:2.4.17-6.el9.tuxcare.els5.x86_64",
                "product": {
                  "name": "haproxy-0:2.4.17-6.el9.tuxcare.els5.x86_64",
                  "product_id": "haproxy-0:2.4.17-6.el9.tuxcare.els5.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/haproxy@2.4.17-6.el9.tuxcare.els5?arch=x86_64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "haproxy-0:2.4.17-6.el9.tuxcare.els4.x86_64",
                "product": {
                  "name": "haproxy-0:2.4.17-6.el9.tuxcare.els4.x86_64",
                  "product_id": "haproxy-0:2.4.17-6.el9.tuxcare.els4.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/haproxy@2.4.17-6.el9.tuxcare.els4?arch=x86_64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "haproxy-0:2.4.17-6.el9.tuxcare.els3.x86_64",
                "product": {
                  "name": "haproxy-0:2.4.17-6.el9.tuxcare.els3.x86_64",
                  "product_id": "haproxy-0:2.4.17-6.el9.tuxcare.els3.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/haproxy@2.4.17-6.el9.tuxcare.els3?arch=x86_64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "haproxy-0:2.4.17-6.el9.tuxcare.els1.x86_64",
                "product": {
                  "name": "haproxy-0:2.4.17-6.el9.tuxcare.els1.x86_64",
                  "product_id": "haproxy-0:2.4.17-6.el9.tuxcare.els1.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/haproxy@2.4.17-6.el9.tuxcare.els1?arch=x86_64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          }
        ],
        "category": "vendor",
        "name": "TuxCare"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "haproxy-0:2.4.17-6.el9.tuxcare.els5.x86_64 as a component of AlmaLinux 9.2",
          "product_id": "AlmaLinux-9.2:haproxy-0:2.4.17-6.el9.tuxcare.els5.x86_64"
        },
        "product_reference": "haproxy-0:2.4.17-6.el9.tuxcare.els5.x86_64",
        "relates_to_product_reference": "AlmaLinux-9.2"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "haproxy-0:2.4.17-6.el9.tuxcare.els4.x86_64 as a component of AlmaLinux 9.2",
          "product_id": "AlmaLinux-9.2:haproxy-0:2.4.17-6.el9.tuxcare.els4.x86_64"
        },
        "product_reference": "haproxy-0:2.4.17-6.el9.tuxcare.els4.x86_64",
        "relates_to_product_reference": "AlmaLinux-9.2"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "haproxy-0:2.4.17-6.el9.tuxcare.els3.x86_64 as a component of AlmaLinux 9.2",
          "product_id": "AlmaLinux-9.2:haproxy-0:2.4.17-6.el9.tuxcare.els3.x86_64"
        },
        "product_reference": "haproxy-0:2.4.17-6.el9.tuxcare.els3.x86_64",
        "relates_to_product_reference": "AlmaLinux-9.2"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "haproxy-0:2.4.17-6.el9.tuxcare.els1.x86_64 as a component of AlmaLinux 9.2",
          "product_id": "AlmaLinux-9.2:haproxy-0:2.4.17-6.el9.tuxcare.els1.x86_64"
        },
        "product_reference": "haproxy-0:2.4.17-6.el9.tuxcare.els1.x86_64",
        "relates_to_product_reference": "AlmaLinux-9.2"
      }
    ]
  },
  "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": "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": [
          "AlmaLinux-9.2:haproxy-0:2.4.17-6.el9.tuxcare.els5.x86_64"
        ],
        "known_affected": [
          "AlmaLinux-9.2:haproxy-0:2.4.17-6.el9.tuxcare.els1.x86_64",
          "AlmaLinux-9.2:haproxy-0:2.4.17-6.el9.tuxcare.els3.x86_64",
          "AlmaLinux-9.2:haproxy-0:2.4.17-6.el9.tuxcare.els4.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",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-06-29T14:55:34.502931Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1782744931",
          "product_ids": [
            "AlmaLinux-9.2:haproxy-0:2.4.17-6.el9.tuxcare.els5.x86_64"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1782744931"
        },
        {
          "category": "none_available",
          "date": "2026-06-18T17:16:00Z",
          "details": "Affected",
          "product_ids": [
            "AlmaLinux-9.2:haproxy-0:2.4.17-6.el9.tuxcare.els1.x86_64",
            "AlmaLinux-9.2:haproxy-0:2.4.17-6.el9.tuxcare.els3.x86_64",
            "AlmaLinux-9.2:haproxy-0:2.4.17-6.el9.tuxcare.els4.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "AlmaLinux-9.2:haproxy-0:2.4.17-6.el9.tuxcare.els5.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Critical"
        }
      ]
    }
  ]
}