{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.23.35"
              },
              {
                "introduced": "1.0.0-M1"
              },
              {
                "fixed": "1.0.0-M47"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "introduced": "756ce63aee681c5b632bbeafe0b8fde2f3d237f4"
            },
            {
              "fixed": "a83f5f4f7e14c5b4d4a91dd71b105cbbbb391298"
            },
            {
              "fixed": "6083780a3009bd7b26033b0ceb3d32c658b0377e"
            },
            {
              "fixed": "7f065101c45f3d86bc105e8fc6323c2c4a11471f"
            }
          ],
          "repo": "https://github.com/http4s/http4s",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-9xww-74xv-gjfp"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-294"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69206.json"
  },
  "details": "Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, DigestAuth replay protection records lastNc plus one instead of the highest nonce-count value it has accepted. When a legitimate client sends noncontiguous nc values because of parallel or retried requests, the stored counter remains below the accepted maximum, allowing a passive observer to replay a captured Authorization header multiple times. Successful replays execute authenticated requests, including state-changing operations, as the captured user. This issue is fixed in versions 0.23.35 and 1.0.0-M47.",
  "id": "CVE-2026-69206",
  "modified": "2026-09-18T03:30:21.606224518Z",
  "published": "2026-09-15T19:29:40.341Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/releases/tag/v0.23.35"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/releases/tag/v1.0.0-M47"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69206.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/http4s/http4s/security/advisories/GHSA-9xww-74xv-gjfp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-69206"
    },
    {
      "type": "FIX",
      "url": "https://github.com/http4s/http4s/commit/7f065101c45f3d86bc105e8fc6323c2c4a11471f"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Http4s: DigestAuth allows replay of captured requests"
}