Digest Authentication Replay Protection Bypass in http4k by Affected Vendor
CVE-2026-100834

8.2HIGH

Key Information:

Vendor

Http4k

Status
Http4k
Vendor
CVE Published:
27 September 2026

What is CVE-2026-100834?

The vulnerability in http4k's Digest authentication module allows attackers to bypass replay protection, as the nonceVerifier parameter defaults to accept all nonce values. This means that valid 'Authorization: Digest' responses can be reused indefinitely against the same protected resource, posing a significant risk for applications utilizing this authentication method. Users are encouraged to update to the latest versions to mitigate this security issue.

Affected Version(s)

http4k 0 < 6.48.0.0

http4k 0 < 5.42.0.0

http4k 0 < 4.51.0.0

References

https://github.com/http4k/http4k/security/advisories/GHSA...
vendor-advisory
https://github.com/http4k/http4k/commit/8a52b615b1
patch
https://github.com/http4k/http4k/commit/4f904b4692
patch

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.