{
  "document": {
    "aggregate_severity": {
      "namespace": "https://access.redhat.com/security/updates/classification/",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright © Red Hat, Inc. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "An update for Red Hat Hardened Images RPMs is now available.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "This update includes the following RPMs:\n\nlibssh2:\n  * libssh2-1.11.1-10.3.hum1 (aarch64, x86_64)\n  * libssh2-devel-1.11.1-10.3.hum1 (aarch64, x86_64)\n  * libssh2-docs-1.11.1-10.3.hum1 (noarch)\n  * libssh2-1.11.1-10.3.hum1.src (src)\n\nSecurity Fix(es):\n\nlibssh2:\n  * CVE-2026-66035",
        "title": "Details"
      },
      {
        "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 Red Hat Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://access.redhat.com/security/team/contact/",
      "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
      "name": "Red Hat Product Security",
      "namespace": "https://www.redhat.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://access.redhat.com/errata/RHSA-2026:46955",
        "url": "https://access.redhat.com/errata/RHSA-2026:46955"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/cve/CVE-2026-66035",
        "url": "https://access.redhat.com/security/cve/CVE-2026-66035"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/updates/classification/",
        "url": "https://access.redhat.com/security/updates/classification/"
      },
      {
        "category": "external",
        "summary": "https://images.redhat.com/",
        "url": "https://images.redhat.com/"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_46955.json"
      }
    ],
    "title": "Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update",
    "tracking": {
      "current_release_date": "2026-10-05T18:14:55+00:00",
      "generator": {
        "date": "2026-10-05T18:14:55+00:00",
        "engine": {
          "name": "Red Hat SDEngine",
          "version": "5.4.0"
        }
      },
      "id": "RHSA-2026:46955",
      "initial_release_date": "2026-07-27T19:37:50+00:00",
      "revision_history": [
        {
          "date": "2026-07-27T19:37:50+00:00",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-07-27T19:46:16+00:00",
          "number": "2",
          "summary": "Last updated version"
        },
        {
          "date": "2026-10-05T18:14:55+00:00",
          "number": "3",
          "summary": "Last generated version"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Red Hat Hardened Images",
                "product": {
                  "name": "Red Hat Hardened Images",
                  "product_id": "Red Hat Hardened Images",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:redhat:hummingbird:1"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Red Hat Hardened Images"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "libssh2-0:1.11.1-10.3.hum1@aarch64",
                "product": {
                  "name": "libssh2-0:1.11.1-10.3.hum1@aarch64",
                  "product_id": "libssh2-0:1.11.1-10.3.hum1@aarch64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/libssh2@1.11.1-10.3.hum1?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "libssh2-devel-0:1.11.1-10.3.hum1@aarch64",
                "product": {
                  "name": "libssh2-devel-0:1.11.1-10.3.hum1@aarch64",
                  "product_id": "libssh2-devel-0:1.11.1-10.3.hum1@aarch64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/libssh2-devel@1.11.1-10.3.hum1?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "aarch64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "libssh2-0:1.11.1-10.3.hum1@src",
                "product": {
                  "name": "libssh2-0:1.11.1-10.3.hum1@src",
                  "product_id": "libssh2-0:1.11.1-10.3.hum1@src",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/libssh2@1.11.1-10.3.hum1?arch=src&distro=hummingbird-20251124&repository_id=public-hummingbird-source-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "src"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "libssh2-0:1.11.1-10.3.hum1@x86_64",
                "product": {
                  "name": "libssh2-0:1.11.1-10.3.hum1@x86_64",
                  "product_id": "libssh2-0:1.11.1-10.3.hum1@x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/libssh2@1.11.1-10.3.hum1?arch=x86_64&distro=hummingbird-20251124&repository_id=public-hummingbird-x86_64-rpms"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "libssh2-devel-0:1.11.1-10.3.hum1@x86_64",
                "product": {
                  "name": "libssh2-devel-0:1.11.1-10.3.hum1@x86_64",
                  "product_id": "libssh2-devel-0:1.11.1-10.3.hum1@x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/libssh2-devel@1.11.1-10.3.hum1?arch=x86_64&distro=hummingbird-20251124&repository_id=public-hummingbird-x86_64-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-aarch64-rpms",
                "product": {
                  "name": "libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-aarch64-rpms",
                  "product_id": "libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-aarch64-rpms",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/libssh2-docs@1.11.1-10.3.hum1?arch=noarch&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-x86_64-rpms",
                "product": {
                  "name": "libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-x86_64-rpms",
                  "product_id": "libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-x86_64-rpms",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/libssh2-docs@1.11.1-10.3.hum1?arch=noarch&distro=hummingbird-20251124&repository_id=public-hummingbird-x86_64-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "noarch"
          }
        ],
        "category": "vendor",
        "name": "Red Hat"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh2-0:1.11.1-10.3.hum1@aarch64 as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@aarch64"
        },
        "product_reference": "libssh2-0:1.11.1-10.3.hum1@aarch64",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh2-0:1.11.1-10.3.hum1@src as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@src"
        },
        "product_reference": "libssh2-0:1.11.1-10.3.hum1@src",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh2-0:1.11.1-10.3.hum1@x86_64 as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@x86_64"
        },
        "product_reference": "libssh2-0:1.11.1-10.3.hum1@x86_64",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh2-devel-0:1.11.1-10.3.hum1@aarch64 as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:libssh2-devel-0:1.11.1-10.3.hum1@aarch64"
        },
        "product_reference": "libssh2-devel-0:1.11.1-10.3.hum1@aarch64",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh2-devel-0:1.11.1-10.3.hum1@x86_64 as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:libssh2-devel-0:1.11.1-10.3.hum1@x86_64"
        },
        "product_reference": "libssh2-devel-0:1.11.1-10.3.hum1@x86_64",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-aarch64-rpms"
        },
        "product_reference": "libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-aarch64-rpms",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-x86_64-rpms"
        },
        "product_reference": "libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-x86_64-rpms",
        "relates_to_product_reference": "Red Hat Hardened Images"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-66035",
      "cwe": {
        "id": "CWE-120",
        "name": "Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')"
      },
      "discovery_date": "2026-07-24T17:01:12.401822+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506851"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in libssh2. A malicious SSH server can exploit a pre-authentication heap buffer overflow vulnerability by sending a specially crafted packet during the Encrypt-then-MAC (ETM) cipher negotiation. This allows the server to corrupt heap memory, potentially leading to arbitrary code execution on the connecting client before authentication is complete.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "libssh2: libssh2: Arbitrary code execution via heap buffer overflow during SSH negotiation",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Moderate impact flaw in libssh2 allows a malicious SSH server to trigger a pre-authentication heap buffer overflow on a connecting client. During Encrypt-then-MAC (ETM) cipher negotiation, a specially crafted packet can corrupt heap memory, potentially leading to arbitrary code execution. Exploitation requires a client to connect to a compromised server, limiting the attack surface.",
          "title": "Statement"
        },
        {
          "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": [
          "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@aarch64",
          "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@src",
          "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@x86_64",
          "Red Hat Hardened Images:libssh2-devel-0:1.11.1-10.3.hum1@aarch64",
          "Red Hat Hardened Images:libssh2-devel-0:1.11.1-10.3.hum1@x86_64",
          "Red Hat Hardened Images:libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-aarch64-rpms",
          "Red Hat Hardened Images:libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-x86_64-rpms"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-66035"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506851",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506851"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-66035",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-66035"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-66035",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66035"
        },
        {
          "category": "external",
          "summary": "https://github.com/libssh2/libssh2/commit/42e33d81577ed4b95d4b4f6f845e5ee8efe5eeb4",
          "url": "https://github.com/libssh2/libssh2/commit/42e33d81577ed4b95d4b4f6f845e5ee8efe5eeb4"
        },
        {
          "category": "external",
          "summary": "https://github.com/libssh2/libssh2/pull/2198",
          "url": "https://github.com/libssh2/libssh2/pull/2198"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/libssh2-heap-buffer-overflow-via-etm-cipher-negotiation",
          "url": "https://www.vulncheck.com/advisories/libssh2-heap-buffer-overflow-via-etm-cipher-negotiation"
        }
      ],
      "release_date": "2026-07-24T16:45:24.405000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-27T19:37:50+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@aarch64",
            "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@src",
            "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@x86_64",
            "Red Hat Hardened Images:libssh2-devel-0:1.11.1-10.3.hum1@aarch64",
            "Red Hat Hardened Images:libssh2-devel-0:1.11.1-10.3.hum1@x86_64",
            "Red Hat Hardened Images:libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-aarch64-rpms",
            "Red Hat Hardened Images:libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-x86_64-rpms"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:46955"
        },
        {
          "category": "workaround",
          "details": "To reduce exposure, restrict SSH client connections to only trusted and verified SSH servers. Avoid initiating SSH connections to unknown or unverified hosts, as successful exploitation requires the client to connect to a malicious server.",
          "product_ids": [
            "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@aarch64",
            "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@src",
            "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@x86_64",
            "Red Hat Hardened Images:libssh2-devel-0:1.11.1-10.3.hum1@aarch64",
            "Red Hat Hardened Images:libssh2-devel-0:1.11.1-10.3.hum1@x86_64",
            "Red Hat Hardened Images:libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-aarch64-rpms",
            "Red Hat Hardened Images:libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-x86_64-rpms"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@aarch64",
            "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@src",
            "Red Hat Hardened Images:libssh2-0:1.11.1-10.3.hum1@x86_64",
            "Red Hat Hardened Images:libssh2-devel-0:1.11.1-10.3.hum1@aarch64",
            "Red Hat Hardened Images:libssh2-devel-0:1.11.1-10.3.hum1@x86_64",
            "Red Hat Hardened Images:libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-aarch64-rpms",
            "Red Hat Hardened Images:libssh2-docs-0:1.11.1-10.3.hum1@noarch@public-hummingbird-x86_64-rpms"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "libssh2: libssh2: Arbitrary code execution via heap buffer overflow during SSH negotiation"
    }
  ]
}