{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "6.48.0.0"
              },
              {
                "fixed": "5.42.0.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7adc55e0662f69a6ca111094cf5e04a88da8d87c"
            },
            {
              "fixed": "e41f40814305510d4f82e30bb0bcd12b9928292e"
            },
            {
              "fixed": "4f904b4692"
            },
            {
              "fixed": "8a52b615b1"
            }
          ],
          "repo": "https://github.com/http4k/http4k",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-c7jm-38gq-h67h"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-294"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100834.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "4.51.0.0"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "http4k's Digest authentication module (org.http4k:http4k-security-digest) before versions 6.48.0.0, 5.42.0.0 and 4.51.0.0 defaults the nonceVerifier parameter of ServerFilters.DigestAuth and DigestAuthProvider to { true }, so every nonce is accepted regardless of its value, age, or prior use. Applications relying on this default have no replay protection on Digest authentication: an attacker who can capture a valid 'Authorization: Digest' response (for example by observing network traffic or reading logs) can replay it indefinitely against the same protected resource.",
  "id": "CVE-2026-100834",
  "modified": "2026-09-28T03:30:20.475005710Z",
  "published": "2026-09-27T01:28:32.781Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100834.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/http4k/http4k/security/advisories/GHSA-c7jm-38gq-h67h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-100834"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/http4k-before-6.48.0.0-digest-authentication-replay-protection-bypass"
    },
    {
      "type": "FIX",
      "url": "https://github.com/http4k/http4k/commit/4f904b4692"
    },
    {
      "type": "FIX",
      "url": "https://github.com/http4k/http4k/commit/8a52b615b1"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "http4k before 6.48.0.0 Digest Authentication Replay Protection Bypass"
}