CVE-2026-100834
http4k before 6.48.0.0 Digest Authentication Replay Protection Bypass
- State
- Published
- Severity
- 8.2 High
- Published
- Sep 27, 2026
- Updated
- Oct 29, 2026
- Reserved
- Sep 26, 2026
Description
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. Applications relying on this default have no replay protection on Digest authentication: an attacker who can capture a valid 'Authorization: Digest' response (for example by observing network traffic or reading logs) can replay it indefinitely against the same protected resource.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.2 High | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.9 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-294 Authentication Bypass by Capture-replay
Affected Products
| Product | Versions |
|---|---|
http4khttp4k |
|
http4khttp4k |
|
http4khttp4k |
|
References
- GitHub Security Advisory (GHSA-c7jm-38gq-h67h)vendor-advisory
- Patch Commitpatch
- Patch Commitpatch
- VulnCheck Advisory: http4k before 6.48.0.0 Digest Authentication Replay Protection Bypassthird-party-advisory
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