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Advisory record · GHSA-c7jm-38gq-h67h

http4k: `ServerFilters.DigestAuth` / `DigestAuthProvider` defaulted to an always-true nonce verifier, disabling replay protection in default deployments

CVSS 8.2 HighEPSS 0.0032 · 25th percentile

Published by the GitHub Advisory Database at 19 Jun 2026, 21:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.http4k:http4k-security-digestMaven>=6.0.0.0, <6.48.0.0 || >=5.0.0.0, <5.42.0.0 || <4.51.0.06.48.0.0, 5.42.0.0, 4.51.0.0
Identifiers
GHSA-c7jm-38gq-h67h · CVE-2026-100834
Weakness (CWE)
CWE-294
Tags
Published
19 Jun 2026
Updated
27 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions of http4k-security-digest before 6.48.0.0, 5.42.0.0 and 4.51.0.0 default the nonceVerifier parameter of ServerFilters.DigestAuth and DigestAuthProvider to accept every nonce, which removes replay protection from Digest authentication. An attacker who captures a valid Digest Authorization response, for example through network observation or log access, could replay it against the protected resource. Upgrade to 6.48.0.0, 5.42.0.0 or 4.51.0.0, or, if you cannot, pass an explicit nonceVerifier that tracks issued nonces, enforces a time limit and rejects reuse.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.2 High 4.0 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 CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0032, the 25th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.