AIKIDO-2026-867681
http4s-ember-core_3 is vulnerable to Denial of Service (DoS)
75
High Risk
This Affects:
http4s-ember-core_3TL;DR
Ember's HTTP/2 implementation enqueues inbound DATA into an unbounded per stream buffer and does not apply receive-side flow-control backpressure. A remote peer streams request or response bodies faster than the application consumes them, and the buffered bytes grow without limit. Memory is exhausted and the server is denied service.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you serve HTTP/2 traffic with the Ember backend.
Background info
http4s-ember-core_3 is vulnerable to Denial of Service (DoS) in versions 0.23.9 - 0.23.34.
How to fix this
Upgrade the org.http4s:http4s-ember-core_3 library to the patch version.
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