Answer in brief
CVE-2026-100834 records a High severity (CVSS 8.2) vulnerability in http4k before 6.48.0.0 Digest Authentication Replay Protection Bypass. The current sources do not mark it as known exploited. The current feed maps http4k/http4k (generic), http4k/http4k (generic), http4k/http4k (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps http4k/http4k (generic), http4k/http4k (generic), http4k/http4k (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| http4k/http4kgeneric | >=0 <6.48.0.0 | 6.48.0.0 |
| http4k/http4kgeneric | >=0 <5.42.0.0 | 5.42.0.0 |
| http4k/http4kgeneric | >=0 <4.51.0.0 | 4.51.0.0 |
Published upstream
Sep 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 27, 2026
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.
Quoted source text, attributed separately from HOL analysis.