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

Quick assessment

Affected
http4k http4k
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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. Deploy

CVSS 6.5 · Medium

Affected Version Matrix 3

VendorProduct Version RangeStatus
http4k http4k < 4.51.0.0 affected
>= 5.0.0.0, < 5.42.0.0 affected
>= 6.0.0.0, < 6.50.0.0 affected
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I. Basic Information for CVE-2026-54147

Vulnerability Information

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Vulnerability Title
http4k: `DigestAuthProvider.verify` ignored configured algorithm and did not bind to request URI
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用已被攻破或存在风险的密码学算法
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
http4k http4k < 4.51.0.0 -

II. Public POCs for CVE-2026-54147

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III. Intelligence Information for CVE-2026-54147

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Patches & Fixes for CVE-2026-54147 (1)

Other References for CVE-2026-54147 (2)

IV. Related Vulnerabilities

Same product: http4k
Same vendor: http4k
Same weakness: CWE-327

V. Comments for CVE-2026-54147

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