AIKIDO-2026-662773
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 frame reader buffers a frame's full declared payload into memory before validating it against the negotiated SETTINGS_MAX_FRAME_SIZE. A peer can declare a frame up to 16 MiB while advertising a 16 KiB limit, giving about 1024x amplification per connection. Across the default connection limit this consumes many gigabytes of heap and exhausts server memory. The fix checks the declared frame size before buffering the payload.
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 0.23.9 - 0.23.36.
How to fix this
Upgrade the org.http4s:http4s-ember-core_3 library to the patch version.
Are You Affected?
Connect your repositories to instantly see whether vulnerable or malicious packages exist in your codebase.
Free. No credit card required.
I consent to receiving marketing communications based on Aikido’s Privacy Policy.
SOC 2Compliant
ISO 27001CompliantISO 42001Compliant
FedRAMPImplementing© All Intel data is openly available and commercially licensed.