What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-18 · updated 2026-09-24
• Weakness: CWE-327

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 products

• http4k: before 4.51.0.0; from 5.0.0.0, < 5.42.0.0; from 6.0.0.0, < 6.50.0.0

References

• https://github.com/http4k/http4k/commit/65d23d99fc5afbe34f29d8f61d0a003fbebb381c
• https://github.com/http4k/http4k/releases/tag/6.50.0.0
• https://github.com/http4k/http4k/security/advisories/GHSA-vxxm-wwqh-mh47

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