Vulnerability in Http4k
CVE-2026-54148
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 does not compare the uri parameter in an Authorization: Digest response with the actual request URL. An attacker who captures a valid Digest authentication response can replay it against another URL served by the same realm, bypassing the per-request-URI binding and potentially gaining unauthorized read or write access. This issue is fixed in versions 4.51.0.0, 5.42.0.0, and 6.50.0.0.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
Affected products
- Http4k — versions < 4.51.0.0, >= 5.0.0.0, < 5.42.0.0, >= 6.0.0.0, < 6.50.0.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-54148?
- CVE-2026-54148 is a high-severity vulnerability in Http4k, classified under Authentication Bypass by Capture-replay. CVSS score: 8.1/10. Published 2026-09-18.
- How severe is CVE-2026-54148?
- High severity. CVSS v3 base score is 8.1 out of 10.