Security advisory

{
  "id": "e26474e706876fdf101d7e8460038ab84cb224c667a74c5fd4c7bce10b1fb6ea",
  "url": "https://osv.dev/vulnerability/CVE-2023-1667",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2023-1667",
    "summary": "A NULL pointer dereference was found In libssh during re-keying with algorithm guessing. This issue may allow an authenticated client to cause a denial of service.",
    "evidence": "osv:CVE-2023-1667",
    "products": [],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-1667",
      "aliases": [
        "CVE-2023-1667"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://gitlab.com/libssh/libssh-mirror",
              "type": "GIT",
              "events": [
                {
                  "introduced": "67c0ce3d219a1565491c30d6e5815a73eaea70a4"
                },
                {
                  "last_affected": "da6d026c125712d197479a7930b4efc117bfe7af"
                },
                {
                  "introduced": "7f6b3fab4e8d4b97e73d5ca60ddc5a3d0f5880d2"
                },
                {
                  "last_affected": "e8322817a9e5aaef0698d779ddd467a209a85d85"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.9.1"
                      },
                      {
                        "last_affected": "0.9.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.10.0"
                      },
                      {
                        "last_affected": "0.10.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "libssh-0.10.4",
            "libssh-0.10.3",
            "libssh-0.10.2",
            "libssh-0.10.0",
            "libssh-0.9.6",
            "libssh-0.9.5",
            "libssh-0.9.4",
            "libssh-0.9.3",
            "libssh-0.9.2",
            "libssh-0.9.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-1667.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.187867747Z",
      "provider": "osv",
      "references": [
        "https://access.redhat.com/security/cve/CVE-2023-1667",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/1xxx/CVE-2023-1667.json",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/27PD44ALQTZXX7K6JAM3BXBUHYA6DFFN/",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-1667",
        "https://security.gentoo.org/glsa/202312-05",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2182199",
        "https://lists.debian.org/debian-lts-announce/2023/05/msg00029.html"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-476"
        ],
        "cna_assigner": "redhat",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "libssh-2"
                  },
                  {
                    "last_affected": "libssh-2"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandaloneSingleVersion"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/1xxx/CVE-2023-1667.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-1667",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 490750,
  "published_at": "2023-05-26T00:00:00+00:00"
}