CVE-2026-69213

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember HTTP/2 serializes outbound frames through one unbounded queue consumed by writeLoop. When the peer stops reading, an unauthenticated HTTP/2 client can continue sending PING, SETTINGS, or DATA frames that cause Ember to enqueue acknowledgments or WINDOW_UPDATE frames faster than the writer drains them, exhausting heap memory on a server built with withHttp2. The shared behavior also affects an ember-client connected to a hostile HTTP/2 server, and the patch replaces the unbounded path with bounded, backpressured outbound queues. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

• CWE-400
• CWE-770

• https://github.com/http4s/http4s/commit/13fe24d6440bde2f1eb70121486cf59c278e6bae
• 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-8f3q-3jmv-7prw

Published

Sep 15, 2026

Last Modified

Sep 17, 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-2026-69208Http4s 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
• CVE-2026-69212Http4s is a Scala interface for HTTP services. Prior to 0.23…5.9
• CVE-2026-69214Http4s is a Scala interface for HTTP services. Prior to 0.23…6.8
• CVE-2026-69215Http4s is a Scala interface for HTTP services. Prior to 0.23…6.8
• CVE-2026-69216Http4s is a Scala interface for HTTP services. Prior to 0.23…5.4
• CVE-2026-69217Http4s is a Scala interface for HTTP services. Prior to 0.23…8.7
• CVE-2026-69218Http4s is a Scala interface for HTTP services. Prior to 0.23…7.5
• CVE-2026-69219The RabbitMQ Java client library allows Java and JVM-based a…8.7