http4k has 10 CVEs on record. Disclosure cadence is accelerating: 6 in the last 90 days against 4 in the 90 before. The busiest recent month was September 2026 with 6. The median CVSS is 6.5 (medium). None have a confirmed exploitation report. The most common weakness class is CWE-294 (3). Most affected products: http4k (6), org.http4k:http4k-core (3), org.http4k:http4k-security-digest (1).
CVEs per month
Last 12 months, by publish date
- Exploited share
- 0% vs 1% corpus
- Median CVSS
- 6.5
- Publish → KEV
- —
- Last 90 days
- 6 prev 4
Products
- http4k 6
- org.http4k:http4k-core 3
- org.http4k:http4k-security-digest 1
Worst active — by depth score
CVE-2026-54148High· 8.1http4k is a functional toolkit for Kotlin HTTP applications45CVE-2026-53659High· 7.5http4k is a functional toolkit for Kotlin HTTP applications41GHSA-m4w9-hjfw-vwj4Highhttp4k: `HmacSha256.hash` (despite the `Hmac` naming) computed a plain unkeyed digest; clarified by deprecation in favour of `Sha256.hash` / `Sha256.hmac`41CVE-2026-100725Medium· 6.5http4k (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…36CVE-2026-54147Medium· 6.5http4k is a functional toolkit for Kotlin HTTP applications36
http4k vulnerabilities
CVEs affecting http4k, newest first. Open any entry for full detail, references, and exploit status.
10 CVEsRSS
CVE-2026-100834Medium· 5.9http4k'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…
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…
CVE-2026-100725Medium· 6.5http4k (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…
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…
CVE-2026-100724Medium· 5.4http4k (Maven package org.http4k:http4k-core) before 6.49.0.0, 5.42.0.0 and 4.51.0.0 uses substring (Contains) matching on the Host header by default in reverseProxy() and reverseProxyRouting() when dispatching to configured virtual host…
http4k (Maven package org.http4k:http4k-core) before 6.49.0.0, 5.42.0.0 and 4.51.0.0 uses substring (Contains) matching on the Host header by default in reverseProxy() and reverseProxyRouting() when dispatching to configured virtual host…
CVE-2026-54147Medium· 6.5http4k is a functional toolkit for Kotlin HTTP applications
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 wit…
CVE-2026-54148High· 8.1http4k is a functional toolkit for Kotlin HTTP applications
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 …
CVE-2026-53659High· 7.5http4k is a functional toolkit for Kotlin HTTP applications
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 decompress…
GHSA-jrpc-7vxp-69p6Mediumhttp4k: `reverseProxy()` defaulted to substring (`Contains`) matching on `Host`; tightened to `Exact`
http4k: `reverseProxy()` defaulted to substring (`Contains`) matching on `Host`; tightened to `Exact`
GHSA-m4w9-hjfw-vwj4Highhttp4k: `HmacSha256.hash` (despite the `Hmac` naming) computed a plain unkeyed digest; clarified by deprecation in favour of `Sha256.hash` / `Sha256.hmac`
http4k: `HmacSha256.hash` (despite the `Hmac` naming) computed a plain unkeyed digest; clarified by deprecation in favour of `Sha256.hash` / `Sha256.hmac`
GHSA-pr33-38xx-6r26Mediumhttp4k: BasicCookieStorage` (renamed `InsecureCookieStorage`) did not enforce RFC 6265 cookie scoping; new `DefaultCookieStorage` is now the default
http4k: BasicCookieStorage` (renamed `InsecureCookieStorage`) did not enforce RFC 6265 cookie scoping; new `DefaultCookieStorage` is now the default
GHSA-c7jm-38gq-h67hMediumhttp4k: `ServerFilters.DigestAuth` / `DigestAuthProvider` defaulted to an always-true nonce verifier, disabling replay protection in default deployments
http4k: `ServerFilters.DigestAuth` / `DigestAuthProvider` defaulted to an always-true nonce verifier, disabling replay protection in default deployments