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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
http4k http4k unaffected
Version Status Constraints
0 affected < 6.48.0.0
6.48.0.0 unaffected —
http4k http4k unaffected
Version Status Constraints
0 affected < 5.42.0.0
5.42.0.0 unaffected —
http4k http4k unaffected
Version Status Constraints
0 affected < 4.51.0.0
4.51.0.0 unaffected —

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/http4k/http4k/commit/4f904b4692 cve-icon cve-icon
https://github.com/http4k/http4k/commit/8a52b615b1 cve-icon cve-icon
https://github.com/http4k/http4k/security/advisories/GHSA-c7jm-38gq-h67h cve-icon cve-icon
https://www.vulncheck.com/advisories/http4k-before-6.48.0.0-digest-authentication-replay-protection-bypass cve-icon cve-icon
History

Sun, 27 Sep 2026 02:00:00 +0000

Type Values Removed Values Added
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.
Title http4k before 6.48.0.0 Digest Authentication Replay Protection Bypass
Weaknesses CWE-294
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 8.2, 'vector': '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'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-27T01:28:32.781Z

Reserved: 2026-09-26T23:23:03.410Z

Link: CVE-2026-100834

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-27T02:17:21.487

Modified: 2026-09-27T02:17:21.487

Link: CVE-2026-100834

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses