Libssh: null pointer dereference in libssh kex session id calculation

{
  "id": "42934e36815a82328be9f5f392136f63f250449a22d106bb1097f9b5d5b3f831",
  "url": "https://osv.dev/vulnerability/CVE-2025-8114",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Libssh: null pointer dereference in libssh kex session id calculation",
    "summary": "A flaw was found in libssh, a library that implements the SSH protocol. When calculating the session ID during the key exchange (KEX) process, an allocation failure in cryptographic functions may lead to a NULL pointer dereference. This issue can cause the client or server to crash.",
    "evidence": "osv:CVE-2025-8114",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-8114",
      "aliases": [
        "CVE-2025-8114"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.libssh.org/projects/libssh.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "301d0e16dfa8a5cac1cff956b6880ca90eb82864"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.11.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            },
            {
              "repo": "https://gitlab.com/libssh/libssh-mirror",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "dff6c0821ed54f6fbf5b755af43f54cbb723b1b1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.11.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "libssh-0.11.2",
            "libssh-0.11.1",
            "libssh-0.11.0",
            "libssh-0.8.0",
            "release-0-3-0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-8114.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.318370683Z",
      "provider": "osv",
      "references": [
        "https://access.redhat.com/downloads/content/package-browser/",
        "https://git.libssh.org/projects/libssh.git/",
        "https://git.libssh.org/projects/libssh.git/commit/?id=53ac23ded4cb2c5463f6c4cd1525331bd578812d",
        "https://git.libssh.org/projects/libssh.git/commit/?id=65f363c9",
        "https://access.redhat.com/errata/RHSA-2026:18683",
        "https://access.redhat.com/security/cve/CVE-2025-8114",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/8xxx/CVE-2025-8114.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-8114",
        "https://www.libssh.org/security/advisories/CVE-2025-8114.txt",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2383220"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-476"
        ],
        "cna_assigner": "redhat",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "0:0.10.4-18.el9"
                  },
                  {
                    "fixed": "0:0.10.4-18.el9"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "InverseAffectedRanges"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/8xxx/CVE-2025-8114.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-8114",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499604,
  "published_at": "2025-07-24T14:14:47.745+00:00"
}