# CVE-2026-54148: http4k DigestAuthProvider request URI validation bypass

Source: https://junglewise.ai/threats/cve-2026-54148-http4k-digestauthprovider-request-uri-validation-bypass  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-18. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-54148 · Severity: high · CVSS 8.1 · Published 2026-09-18

http4k is a Kotlin web framework that includes HTTP Digest authentication support. A flaw in the DigestAuthProvider allowed attackers to replay captured authentication credentials against different URLs within the same realm, bypassing the per-URL binding that Digest authentication is designed to enforce. This could allow an attacker to impersonate legitimate users across multiple endpoints.

Vendors: [Http4k](https://junglewise.ai/threats/vendors/http4k), [Maven](https://junglewise.ai/threats/vendors/maven).

## Quick answers

**Is CVE-2026-54148 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-54148 being exploited in the wild.

**How severe is CVE-2026-54148?** High severity, with a CVSS score of 8.1, published 18 September 2026.

**Which products and versions are affected?** Http4k before 6.50.0.0 (v6.x), before 5.42.0.0 (v5.x LTS), before 4.51.0.0 (v4.x LTS); org.http4k:http4k-security-digest (Maven) ECOSYSTEM:introduced=6.0.0.0,fixed=6.50.0.0.

**Is there a fix for CVE-2026-54148?** Yes. org.http4k:http4k-security-digest (Maven): upgrade to 6.50.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-54148 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-54148?** Check whether you run Http4k or org.http4k:http4k-security-digest (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- org.http4k:http4k-security-digest (Maven): upgrade to 6.50.0.0 or later

  ```sh
  # set org.http4k:http4k-security-digest to 6.50.0.0 in your pom.xml or build.gradle
  ```


## Technical details

The vulnerability exists in DigestAuthProvider.verify, which failed to validate that the `uri` parameter in a client's Digest Authorization header matched the actual request URL. Digest authentication (RFC 7616) binds credentials to a specific request URI to prevent replay attacks; this implementation skipped that check. An attacker who captures a valid Digest authentication response for one URL could replay it against any other URL in the same realm without re-authentication. The fix (commit 725f1b9697) rejects credentials whose URI parameter does not match the request URL. Patches are available in community edition 6.50.0.0 and enterprise LTS editions 5.42.0.0 and 4.51.0.0.

## Affected products

- http4k http4k before 6.50.0.0 (v6.x), before 5.42.0.0 (v5.x LTS), before 4.51.0.0 (v4.x LTS)

## Identifiers

- CVE-2026-54148
- GHSA-p28p-j94q-pg32

## Timeline

- 2026-08-17: disclosed: GHSA-p28p-j94q-pg32 published

## Related threats

- [http4k http4k-security-digest weak cryptographic algorithm in DigestAuthProvider](https://junglewise.ai/threats/cve-2026-54147-http4k-http4k-security-digest-weak-cryptographic-algorithm-in)