CVE-2026-100725: Exposure of Sensitive Information to an Unauthorized Actor

http4k Maven artifact org.http4k:http4k-core before 6.48.0.0, 5.42.0.0, and 4.51.0.0 ships a BasicCookieStorage client-side cookie store used by ClientFilters.Cookies that does not enforce RFC 6265 scoping rules for the cookie domain, path, and Secure attributes. When a single BasicCookieStorage...

CVE-2026-100834: Authentication Bypass by Capture-replay

http4k's Digest authentication module org.http4k:http4k-security-digest before versions 6.48.0.0, 5.42.0.0 and 4.51.0.0 defaults the nonceVerifier parameter of ServerFilters.DigestAuth and DigestAuthProvider to true , so every nonce is accepted regardless of its value, age, or prior use...

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...

CVE-2026-54147

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 therefor...

EUVD-2026-83042

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 therefor...

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

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 therefor...

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

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 therefor...

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

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 therefor...

CVE-2026-54147

http4k-security-digest (a module of the Kotlin HTTP toolkit http4k) contains a bug in DigestAuthProvider.verify where the configured algorithm parameter is silently ignored and every digest response is verified with hardcoded MD5 , regardless of the intended algorithm. Deployments believing they ...

CVE-2026-54148 http4k: `DigestAuthProvider.verify` did not bind to request URI

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...

CVE-2026-54148 http4k: `DigestAuthProvider.verify` did not bind to request URI

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...

CVE-2026-54148 http4k: `DigestAuthProvider.verify` did not bind to request URI

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...

EUVD-2026-83039

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...

CVE-2026-54148

http4k (a Kotlin HTTP toolkit) is vulnerable in the http4k-security-digest module. The DigestAuthProvider.verify method did not compare the uri parameter in an Authorization: Digest response with the actual request URL, meaning a captured valid Digest authentication response could be replayed aga...

CVE-2026-54148: Authentication Bypass by Capture-replay

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...

CVE-2026-54147: Use of a Broken or Risky Cryptographic Algorithm

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 therefor...

CVE-2026-53659

A flaw was found in http4k, a functional toolkit for Kotlin HTTP applications. The ServerFilters.GZip and RequestFilters.GunZip functions, along with underlying Gzip request-body decompression, do not limit the decompressed size of incoming data. An unauthenticated client can exploit this by...

PT-2026-92403

The static content handlers ResourceService and WebjarService URL decode each path segment and then reject only segments that are exactly "", ".", or "..". A percent-encoded separator %2F lets an attacker smuggle a ../ segment past that filter and escape the configured base, reading resources tha...

CVE-2026-53659

http4k is a functional toolkit for Kotlin HTTP applications. Prior to 4.51.0.0, 5.42.0.0, and 6.49.0.0, ServerFilters.GZip, RequestFilters.GunZip, and the underlying Gzip request-body decompression functions impose no limit on decompressed size. An unauthenticated client can send a small...

CVE-2026-53659

http4k is a functional Kotlin HTTP toolkit. The vulnerability (CWE-409) exists in ServerFilters.GZip , RequestFilters.GunZip , and the underlying gzip decompression functions, which imposed no cap on decompressed size . An unauthenticated client can send a small gzip-encoded request body that exp...