CVE-2026-69206

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.

• CWE-294

• 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

Published

Sep 15, 2026

Last Modified

Sep 16, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-69200node-opcua is an OPC UA implementation for TypeScript and No…3.7
• CVE-2026-69201Http4s is a Scala interface for HTTP services. Prior to 0.23…5.9
• CVE-2026-69202Http4s is a Scala interface for HTTP services. Prior to 0.23…7.5
• CVE-2026-69203Http4s is a Scala interface for HTTP services. Prior to 0.23…7.5
• CVE-2026-69204Http4s is a Scala interface for HTTP services. Prior to 0.23…9.2
• CVE-2026-69205Http4s is a Scala interface for HTTP services. Prior to 0.23…8.7
• CVE-2026-69207Hono is a Web application framework that provides support fo…5.3
• CVE-2026-69208Http4s is a Scala interface for HTTP services. Prior to 0.23…7.5
• CVE-2026-69209Http4s is a Scala interface for HTTP services. Prior to 0.23…7.5
• CVE-2026-6921Race in GPU in Google Chrome on Windows prior to 147.0.7727.…8.3
• CVE-2026-69210Http4s is a Scala interface for HTTP services. Prior to 0.23…7.5
• CVE-2026-69211Http4s is a Scala interface for HTTP services. Prior to 0.23…4.8