{"id":"CVE-2026-100834","title":"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…","summary":"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…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-294"],"vendor":"http4k","product":"http4k","affected":["http4k < 6.48.0.0","http4k < 5.42.0.0","http4k < 4.51.0.0"],"published":"2026-09-27","updated":"2026-09-27","sourceUpdated":"2026-09-27T02:17:21.487","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100834","references":[{"url":"https://github.com/http4k/http4k/commit/4f904b4692","label":"disclosure@vulncheck.com"},{"url":"https://github.com/http4k/http4k/commit/8a52b615b1","label":"disclosure@vulncheck.com"},{"url":"https://github.com/http4k/http4k/security/advisories/GHSA-c7jm-38gq-h67h","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/http4k-before-6.48.0.0-digest-authentication-replay-protection-bypass","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-27T02:41:45.569Z","slug":"CVE-2026-100834","body":"## Overview\n\nhttp4k'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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}