CVE-2026-100834 json
http4k before 6.48.0.0 Digest Authentication Replay Protection Bypass
published 4mo ago modified 11d ago also GHSA-c7jm-38gq-h67h , EUVD-2026-87852
- cvss
- 5.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 25%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- maven org.http4k:http4k-security-digest 4.51.0.0, 5.42.0.0, 6.48.0.0
- http4k http4k 4.51.0.0, 5.42.0.0, 6.48.0.0
Is CVE-2026-100834 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- last mo.
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.2 | 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 |
| CNA | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| CNA | 4.0 | 8.2 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | org.http4k:http4k-security-digest | >=6.0.0.0, <6.48.0.0 >=5.0.0.0, <5.42.0.0 <4.51.0.0 |
6.48.0.0 5.42.0.0 4.51.0.0 |
Affected products
- http4k http4k
Classification
- Weakness
-
- CWE-294 Authentication Bypass by Capture-replay
References
-
github.com
/http4k/http4k/commit/8a52b615b1
patch, web
-
github.com
/http4k/http4k/commit/4f904b4692
patch, web
-
github.com
/http4k/http4k/security/advisories/GHSA-c7jm-38gq-h67h
vendor-advisory, web
-
vulncheck.com
/advisories/http4k-before-6.48.0.0-digest-authentication-replay-protection-bypass
third-party-advisory
-
datatracker.ietf.org
/doc/html/rfc7616#section-3.4
web
-
github.com
/http4k/http4k
package
-
github.com
/http4k/http4k/releases/tag/6.48.0.0
web
Sources
- CVE List CVE-2026-100834
- GitHub Advisory GHSA-c7jm-38gq-h67h
- NVD CVE-2026-100834
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