---
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'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.