{
  "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": "* SECURITY UPDATE: unchecked userauth input lengths let crafted username,\n     password, hostname, method-name or public-key sizes wrap the packet-size\n     arithmetic and produce an undersized heap allocation that is then\n     overflowed\n     - debian/patches/CVE-2026-7598.patch: cap every caller-supplied userauth\n       input at MAX_INPUT_LEN before the allocation size is computed and\n       return LIBSSH2_ERROR_OUT_OF_BOUNDARY instead, in userauth_list(),\n       userauth_password(), userauth_hostbased_fromfile(),\n       _libssh2_userauth_publickey() and userauth_keyboard_interactive() in\n       src/userauth.c\n     - CVE-2026-7598",
        "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-2026:1788943086",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1788943086"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/debian11els/advisories/2026/clsa-2026_1788943086.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-09-09T08:38:52Z",
      "generator": {
        "date": "2026-09-09T08:38:52Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1788943086",
      "initial_release_date": "2026-09-09T08:38:52Z",
      "revision_history": [
        {
          "date": "2026-09-09T08:38:52Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2026-7598"
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Debian 11",
                "product": {
                  "name": "Debian 11",
                  "product_id": "Debian-11",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:debian:debian_linux:11:*:*:*:*:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Debian"
          }
        ],
        "category": "vendor",
        "name": "Software in the Public Interest, Inc."
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.amd64",
                "product": {
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                  }
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              },
              {
                "category": "product_version",
                "name": "libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.amd64",
                "product": {
                  "name": "libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.amd64",
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            ],
            "category": "architecture",
            "name": "amd64"
          },
          {
            "branches": [
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                "category": "product_version",
                "name": "libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.arm64",
                "product": {
                  "name": "libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.arm64",
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                  "product_identification_helper": {
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                  }
                }
              },
              {
                "category": "product_version",
                "name": "libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.arm64",
                "product": {
                  "name": "libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.arm64",
                  "product_id": "libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.arm64",
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                  }
                }
              }
            ],
            "category": "architecture",
            "name": "arm64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.armel",
                "product": {
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              },
              {
                "category": "product_version",
                "name": "libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.armel",
                "product": {
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                  }
                }
              }
            ],
            "category": "architecture",
            "name": "armel"
          }
        ],
        "category": "vendor",
        "name": "TuxCare"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.amd64 as a component of Debian 11",
          "product_id": "Debian-11:libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.amd64"
        },
        "product_reference": "libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.amd64",
        "relates_to_product_reference": "Debian-11"
      },
      {
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        "full_product_name": {
          "name": "libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.arm64 as a component of Debian 11",
          "product_id": "Debian-11:libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.arm64"
        },
        "product_reference": "libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.arm64",
        "relates_to_product_reference": "Debian-11"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.armel as a component of Debian 11",
          "product_id": "Debian-11:libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.armel"
        },
        "product_reference": "libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.armel",
        "relates_to_product_reference": "Debian-11"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.arm64 as a component of Debian 11",
          "product_id": "Debian-11:libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.arm64"
        },
        "product_reference": "libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.arm64",
        "relates_to_product_reference": "Debian-11"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.amd64 as a component of Debian 11",
          "product_id": "Debian-11:libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.amd64"
        },
        "product_reference": "libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.amd64",
        "relates_to_product_reference": "Debian-11"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.armel as a component of Debian 11",
          "product_id": "Debian-11:libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.armel"
        },
        "product_reference": "libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.armel",
        "relates_to_product_reference": "Debian-11"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-7598",
      "notes": [
        {
          "category": "description",
          "text": "A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer overflow. The attack may be launched remotely. The name of the patch is 256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
        "fixed": [
          "Debian-11:libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.amd64",
          "Debian-11:libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.arm64",
          "Debian-11:libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.armel",
          "Debian-11:libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.amd64",
          "Debian-11:libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.arm64",
          "Debian-11:libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.armel"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-7598"
        },
        {
          "category": "external",
          "summary": "https://github.com/libssh2/libssh2/",
          "url": "https://github.com/libssh2/libssh2/"
        },
        {
          "category": "external",
          "summary": "https://github.com/libssh2/libssh2/commit/256d04b60d80bf1190e96b0ad1e91b2174d744b1",
          "url": "https://github.com/libssh2/libssh2/commit/256d04b60d80bf1190e96b0ad1e91b2174d744b1"
        },
        {
          "category": "external",
          "summary": "https://github.com/libssh2/libssh2/pull/1858",
          "url": "https://github.com/libssh2/libssh2/pull/1858"
        },
        {
          "category": "external",
          "summary": "https://vuldb.com/submit/805564",
          "url": "https://vuldb.com/submit/805564"
        },
        {
          "category": "external",
          "summary": "https://vuldb.com/vuln/360555",
          "url": "https://vuldb.com/vuln/360555"
        },
        {
          "category": "external",
          "summary": "https://vuldb.com/vuln/360555/cti",
          "url": "https://vuldb.com/vuln/360555/cti"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:16736",
          "url": "https://access.redhat.com/errata/RHSA-2026:16736"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:61752",
          "url": "https://access.redhat.com/errata/RHSA-2026:61752"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:7021",
          "url": "https://access.redhat.com/errata/RHSA-2026:7021"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/cve/CVE-2026-7598",
          "url": "https://access.redhat.com/security/cve/CVE-2026-7598"
        },
        {
          "category": "external",
          "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2464597",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464597"
        },
        {
          "category": "external",
          "summary": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7598.json",
          "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7598.json"
        }
      ],
      "release_date": "2026-05-01T22:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-09T08:38:09.298291Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1788943086",
          "product_ids": [
            "Debian-11:libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.amd64",
            "Debian-11:libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.arm64",
            "Debian-11:libssh2-1-0:1.9.0-2+deb11u1+tuxcare.els1.armel",
            "Debian-11:libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.amd64",
            "Debian-11:libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.arm64",
            "Debian-11:libssh2-1-dev-0:1.9.0-2+deb11u1+tuxcare.els1.armel"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1788943086"
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}