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.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/http4k/http4k/commit/8a52b615b1 patch
- https://github.com/http4k/http4k/commit/4f904b4692 patch
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.2 · http4kNVD modified 2026-10-29 20:19
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 4
- https://github.com/http4k/http4k/security/advisories/GHSA-c7jm-38gq-h67h vendor-advisory
- https://github.com/http4k/http4k/commit/8a52b615b1 patch
- https://github.com/http4k/http4k/commit/4f904b4692 patch
- https://www.vulncheck.com/advisories/http4k-before-6.48.0.0-digest-authentication-replay-protection-bypass third-party-advisory