EUVD-2026-373541

fkie_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.

GHSA-p28p-j94q-pg32 — http4k: `DigestAuthProvider.verify` did not bind to request URI

Affected: Maven: org.http4k:http4k-security-digest

### Impact

An issue in `DigestAuthProvider.verify`:

The `uri` parameter in the client's `Authorization: Digest …` response was not checked against the actual request URL. A captured Digest authentication response could be replayed against any other URL served by the same realm, breaking the per-request-URL binding the Digest scheme assumes.

**Who is affected:** any application using `http4k-security-digest` for HTTP Digest authentication. The bug has been present since `DigestAuthProvider` was introduced (commit `8a52b615b1`, 2021).

### Patches

| Line | Fixed in | Edition | |------|----------|---------| | v6.x (Community) | **6.50.0.0** | Community | | v5.x (LTS) | **5.42.0.0** | Enterprise — contact [enterprise@http4k.org](mailto:enterprise@http4k.org) (if Digest auth is present in your v5.x line) | | v4.x (LTS) | **4.51.0.0** | Enterprise — contact [enterprise@http4k.org](mailto:enterprise@http4k.org) (if Digest auth is present in your v4.x line) |

The fix: - Rejects credentials whose `uri` parameter does not match the request URL.

### Workarounds

For deployments that cannot upgrade immediately: - **URI binding gap:** place Digest auth behind a reverse proxy that pins requests to a single URL.

### References

- Vulnerability first present: [`8a52b615b1`](https://github.com/http4k/http4k/commit/8a52b615b1) - URI binding fix: [`725f1b9697`](https://github.com/http4k/http4k/commit/725f1b9697) - Fix release: [v6.50.0.0](https://github.com/http4k/http4k/releases/tag/6.…

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EUVD-2026-373541

fkie_cve-2026-54148

GHSA-p28p-j94q-pg32 — http4k: `DigestAuthProvider.verify` did not bind to request URI