---
id: CVE-2026-54147
title: http4k is a functional toolkit for Kotlin HTTP applications
summary: >-
  http4k is a functional toolkit for Kotlin HTTP applications. Prior to
  4.51.0.0, 5.42.0.0, and 6.50.0.0, DigestAuthProvider.verify in
  http4k-security-digest ignores its configured algorithm parameter and verifies
  every Digest response wit…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N'
cwe:
  - CWE-327
vendor: http4k
product: http4k
affected:
  - http4k < 4.51.0.0
  - 'http4k >= 5.0.0.0, < 5.42.0.0'
  - 'http4k >= 6.0.0.0, < 6.50.0.0'
patched:
  - 'org.http4k:http4k-security-digest 5.42.0.0'
  - 'org.http4k:http4k-security-digest 6.50.0.0'
published: '2026-09-18'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:25:27.050'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54147'
references:
  - url: >-
      https://github.com/http4k/http4k/commit/65d23d99fc5afbe34f29d8f61d0a003fbebb381c
    label: security-advisories@github.com
  - url: 'https://github.com/http4k/http4k/releases/tag/6.50.0.0'
    label: security-advisories@github.com
  - url: 'https://github.com/http4k/http4k/security/advisories/GHSA-vxxm-wwqh-mh47'
    label: security-advisories@github.com
  - url: 'https://github.com/http4k/http4k/commit/65d23d99fc'
  - url: 'https://github.com/advisories/GHSA-vxxm-wwqh-mh47'
tags:
  - nvd
  - cve.org
  - ghsa
  - maven
epss: 0.00255
epssPercentile: 0.15177
aliases:
  - GHSA-vxxm-wwqh-mh47
ecosystem: maven
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T17:27:37.221207Z'
ingestedAt: '2026-08-17T22:01:16.781Z'
---

## Overview

http4k is a functional toolkit for Kotlin HTTP applications. Prior to 4.51.0.0, 5.42.0.0, and 6.50.0.0, DigestAuthProvider.verify in http4k-security-digest ignores its configured algorithm parameter and verifies every Digest response with hardcoded MD5. Deployments configured for SHA-256 therefore receive weaker MD5-based verification, exposing Digest authentication to collision-related attack paths that depend on the hash function's collision resistance. This issue is fixed in versions 4.51.0.0, 5.42.0.0, and 6.50.0.0.

## Remediation

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

## Package advisory (CVE-2026-54147)

Affected packages:

- `org.http4k:http4k-security-digest >= 5.0.0.0, < 5.42.0.0`
- `org.http4k:http4k-security-digest <= 4.48.2.0`
- `org.http4k:http4k-security-digest >= 6.0.0.0, < 6.50.0.0`

Patched in:

- `org.http4k:http4k-security-digest 5.42.0.0`
- `org.http4k:http4k-security-digest 6.50.0.0`

Source: https://github.com/advisories/GHSA-vxxm-wwqh-mh47