{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "1.18.0"
              },
              {
                "last_affected": "1.22.2"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2e75f0d9362fb979f5fc92829431a590a130929f"
            }
          ],
          "repo": "https://github.com/krb5/krb5",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "mitre",
    "cwe_ids": [
      "CWE-476"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40355.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "1.18"
          },
          {
            "fixed": "1.22.3"
          }
        ],
        "source": "AFFECTED_FIELD"
      },
      {
        "extracted_events": [
          {
            "introduced": "1.18"
          },
          {
            "fixed": "1.22.3"
          }
        ],
        "source": "CPE_FIELD"
      },
      {
        "extracted_events": [
          {
            "fixed": "1.22.3"
          }
        ],
        "source": "DESCRIPTION"
      }
    ]
  },
  "details": "In MIT Kerberos 5 (aka krb5) before 1.22.3, there is a NULL pointer dereference if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An unauthenticated remote attacker can trigger this, causing the process to terminate in parse_nego_message.",
  "id": "CVE-2026-40355",
  "modified": "2026-07-16T03:31:02.118710262Z",
  "published": "2026-04-28T00:00:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40355.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40355"
    },
    {
      "type": "ADVISORY",
      "url": "https://web.mit.edu/kerberos/advisories/"
    },
    {
      "type": "FIX",
      "url": "https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}