CVE-2026-54147
Published:September 18, 2026
Updated:September 22, 2026
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
https://github.com/http4k/http4k.git (GITHUB):
Affected version(s) >=5.0.0.0 <5.42.0.0Fix Suggestion:
Update to version 5.42.0.0https://github.com/http4k/http4k.git (GITHUB):
Affected version(s) >=6.0.0.0 <6.50.0.0Fix Suggestion:
Update to version 6.50.0.0org.http4k:http4k-security-digest (JAVA):
Affected version(s) >=6.0.0.0 <6.50.0.0Fix Suggestion:
Update to version 6.50.0.0org.http4k:http4k-security-digest (JAVA):
Affected version(s) >=5.0.0.0 <5.42.0.0Fix Suggestion:
Update to version 5.42.0.0Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Use of a Broken or Risky Cryptographic Algorithm
EPSS
Base Score:
0.20