CVE-2026-69206

MediumCVSS 5.9/10Last modified Sep 16, 2026

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.

Metrics

CVSS 3.1 5.9/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-294

Affected software

No affected versions have been published.

Timeline

Published
Sep 15, 2026
Last modified
Sep 16, 2026
NVD status
Deferred

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CVE-2026-69206: Medium severity, CVSS 5.9 | Vulnix