{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "1.25.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "e9697d98e7249b0f68a6be040a4f3dcc5bc101fa"
            }
          ],
          "repo": "https://gitlab.com/gnuwget/wget",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "CERT-PL",
    "cwe_ids": [
      "CWE-606"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16599.json"
  },
  "details": "GNU wget is vulnerable to denial of service in its FTP OPIE/S-KEY authentication functionality. The server-supplied sequence number from the FTP challenge line is used as an iteration count for an MD5 key-derivation loop without any upper bound validation. A malicious FTP server or a network attacker positioned to intercept FTP traffic can send a crafted OPIE challenge with a sequence number near INT_MAX, causing wget to perform up to approximately 2.1 billion MD5 computations and suspend for some time. The --timeout option does not mitigate this because it applies only to network I/O, not CPU computation.\n\n\nThis issue was fixed in commit e9697d98e7249b0f68a6be040a4f3dcc5bc101fa",
  "id": "CVE-2026-16599",
  "modified": "2026-08-30T03:30:14.787820139Z",
  "published": "2026-08-25T14:17:04.941Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://cert.pl/en/posts/2026/08/CVE-2026-16599"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16599.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-16599"
    },
    {
      "type": "FIX",
      "url": "https://gitlab.com/gnuwget/wget/-/commit/e9697d98e7249b0f68a6be040a4f3dcc5bc101fa"
    },
    {
      "type": "PACKAGE",
      "url": "https://gitlab.com/gnuwget/wget"
    },
    {
      "type": "PACKAGE",
      "url": "https://gitlab.com/gnuwget/wget/"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Denial of Service in GNU wget"
}