AIKIDO-2026-66258
http4s-ember-core_3 is vulnerable to Denial of Service (DoS)
75
High Risk
This Affects:
http4s-ember-core_3TL;DR
The Ember HTTP/2 read loop reads frames from the socket with no idle timeout applied to the read itself. A peer that establishes an HTTP/2 connection (cleartext or TLS via ALPN) and then sends nothing keeps the connection open indefinitely. Enough such silent connections fill the pooled maxConnections slots and deny service to legitimate clients. The fix enforces an idle timeout on HTTP/2 socket reads.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you have enabled HTTP/2 on the Ember backend.
Background info
http4s-ember-core_3 is vulnerable to Denial of Service (DoS) in versions 0.23.12 - 0.23.36.
How to fix this
Upgrade the org.http4s:http4s-ember-core_3 library to the patch version.
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