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Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M

CVE-2026-54147http4k: `DigestAuthProvider.verify` ignored configured algorithm and did not bind to request URI

Medium 6.5

In plain English

A medium-severity broken cryptography in http4k from http4k. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 82.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Mavenorg.http4k:http4k-security-digest6.50.0.0GHSA-vxxm-wwqh-mh47
Mavenorg.http4k:http4k-security-digest5.42.0.0GHSA-vxxm-wwqh-mh47
Mavenorg.http4k:http4k-security-digestno fix listedGHSA-vxxm-wwqh-mh47

Affected products (as reported)

VendorProductVersions
http4k http4k < 4.51.0.0>= 5.0.0.0, < 5.42.0.0>= 6.0.0.0, < 6.50.0.0

Weakness: CWE-327 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

References