MEDIUM

CVE-2026-69206

2026-09-15 CVSS v3.1

CVSS

5.9

Description

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, DigestAuth replay protection records lastNc plus one instead of the highest nonce-count value it has accepted. When a legitimate client sends noncontiguous nc values because of parallel or retried requests, the stored counter remains below the accepted maximum, allowing a passive observer to replay a captured Authorization header multiple times. Successful replays execute authenticated requests, including state-changing operations, as the captured user. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

Weakness (CWE)

CWE-294

EPSS Score

0.33%

Probability of exploitation in next 30 days

25.9th percentile

References

https://github.com/http4s/http4s/commit/7f065101c45f3d86bc105e8fc6323c2c4a11471f https://github.com/http4s/http4s/releases/tag/v0.23.35 https://github.com/http4s/http4s/releases/tag/v1.0.0-M47 https://github.com/http4s/http4s/security/advisories/GHSA-9xww-74xv-gjfp

View on dbcve.org

Base CVE data derived from NVD (public domain). Enrichment by dbcve.org (CC-BY-4.0). Fetched via API.

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