{
  "document": {
    "aggregate_severity": {
      "text": "Medium"
    },
    "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_alt_common/el6/vex/2026/cve-2026-58055-els_alt_common-el6.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-10-26T16:35:24Z",
      "generator": {
        "date": "2026-10-26T16:35:24Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CVE-2026-58055-ELS_ALT_COMMON-EL6",
      "initial_release_date": "2026-06-28T02:16:00Z",
      "revision_history": [
        {
          "date": "2026-06-28T02:16:00Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-10-26T16:35:24Z",
          "number": "2",
          "summary": "Official Publication"
        }
      ],
      "status": "final",
      "version": "2"
    },
    "title": "Security update on CVE-2026-58055"
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Community Enterprise Operating System 6",
                "product": {
                  "name": "Community Enterprise Operating System 6",
                  "product_id": "CentOS-6",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:centos:centos:6:*:*:*:*:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Community Enterprise Operating System"
          }
        ],
        "category": "vendor",
        "name": "Cloud Linux Software, Inc."
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "alt-nghttp2-devel-0:1.70.0-1.el6.x86_64",
                "product": {
                  "name": "alt-nghttp2-devel-0:1.70.0-1.el6.x86_64",
                  "product_id": "alt-nghttp2-devel-0:1.70.0-1.el6.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/alt-nghttp2-devel@1.70.0-1.el6?arch=x86_64&os_name=centos&os_version=6"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "alt-nghttp2-0:1.70.0-1.el6.x86_64",
                "product": {
                  "name": "alt-nghttp2-0:1.70.0-1.el6.x86_64",
                  "product_id": "alt-nghttp2-0:1.70.0-1.el6.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/alt-nghttp2@1.70.0-1.el6?arch=x86_64&os_name=centos&os_version=6"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          }
        ],
        "category": "vendor",
        "name": "TuxCare"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "alt-nghttp2-devel-0:1.70.0-1.el6.x86_64 as a component of Community Enterprise Operating System 6",
          "product_id": "CentOS-6:alt-nghttp2-devel-0:1.70.0-1.el6.x86_64"
        },
        "product_reference": "alt-nghttp2-devel-0:1.70.0-1.el6.x86_64",
        "relates_to_product_reference": "CentOS-6"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "alt-nghttp2-0:1.70.0-1.el6.x86_64 as a component of Community Enterprise Operating System 6",
          "product_id": "CentOS-6:alt-nghttp2-0:1.70.0-1.el6.x86_64"
        },
        "product_reference": "alt-nghttp2-0:1.70.0-1.el6.x86_64",
        "relates_to_product_reference": "CentOS-6"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-58055",
      "cwe": {
        "id": "CWE-444",
        "name": "Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')"
      },
      "notes": [
        {
          "category": "description",
          "text": "nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A backend that resolves the resulting ambiguous message in the attacker's favor enables HTTP request/response smuggling and cross-client response-queue poisoning.",
          "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-6:alt-nghttp2-0:1.70.0-1.el6.x86_64",
          "CentOS-6:alt-nghttp2-devel-0:1.70.0-1.el6.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els-alt-common/cve/CVE-2026-58055"
        },
        {
          "category": "external",
          "summary": "https://github.com/bikini/exploitarium/tree/main/nghttp2-nghttpx-upgrade-queue-poison-poc",
          "url": "https://github.com/bikini/exploitarium/tree/main/nghttp2-nghttpx-upgrade-queue-poison-poc"
        },
        {
          "category": "external",
          "summary": "https://github.com/nghttp2/nghttp2/commit/ab28105c4a0197da24f8bfc414bc116055249e1e",
          "url": "https://github.com/nghttp2/nghttp2/commit/ab28105c4a0197da24f8bfc414bc116055249e1e"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/nghttp2-nghttpx-http-request-response-smuggling-via-upgrade-request-with-content-length",
          "url": "https://www.vulncheck.com/advisories/nghttp2-nghttpx-http-request-response-smuggling-via-upgrade-request-with-content-length"
        }
      ],
      "release_date": "2026-06-28T02:16:00Z",
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        },
        {
          "category": "impact",
          "date": "2026-10-26T11:01:12.989620Z",
          "details": "moderate",
          "product_ids": [
            "CentOS-6:alt-nghttp2-0:1.70.0-1.el6.x86_64",
            "CentOS-6:alt-nghttp2-devel-0:1.70.0-1.el6.x86_64"
          ]
        }
      ]
    }
  ]
}