{"cve":"CVE-2026-100834","nvd":{"published":"2026-09-27T02:17:21.487","modified":"2026-09-30T18:18:13.620","status":"Deferred","description":"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.","cvss_v4":{"vector":"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","score":8.2},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9},"cwes":["CWE-294"],"references":["https://github.com/http4k/http4k/commit/4f904b4692","https://github.com/http4k/http4k/commit/8a52b615b1","https://github.com/http4k/http4k/security/advisories/GHSA-c7jm-38gq-h67h","https://www.vulncheck.com/advisories/http4k-before-6.48.0.0-digest-authentication-replay-protection-bypass"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:48.555445741+00:00"},"epss":{"cve":"CVE-2026-100834","score":0.0032,"percentile":0.24811,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-c7jm-38gq-h67h","url":"https://osv.dev/vulnerability/GHSA-c7jm-38gq-h67h","summary":"http4k: `ServerFilters.DigestAuth` / `DigestAuthProvider` defaulted to an always-true nonce verifier, disabling replay protection in default deployments","modified":"2026-09-27T11:56:09.133572902Z","packages":[{"ecosystem":"Maven","name":"org.http4k:http4k-security-digest","purl":"pkg:maven/org.http4k/http4k-security-digest","ranges":[">=6.0.0.0 <6.48.0.0"],"fixed":["6.48.0.0"]},{"ecosystem":"Maven","name":"org.http4k:http4k-security-digest","purl":"pkg:maven/org.http4k/http4k-security-digest","ranges":[">=5.0.0.0 <5.42.0.0"],"fixed":["5.42.0.0"]},{"ecosystem":"Maven","name":"org.http4k:http4k-security-digest","purl":"pkg:maven/org.http4k/http4k-security-digest","ranges":["<4.51.0.0"],"fixed":["4.51.0.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}