AIKIDO-2026-27801
hyper is vulnerable to Denial of Service (DoS)
59
Medium Risk
This Affects:
hyperTL;DR
hyper's HTTP/2 upgraded-stream writer keeps pushing data into the h2 send buffer even when poll_capacity() reports that no flow-control capacity is available. This bypasses the max_send_buffer_size backpressure mechanism on upgraded streams such as HTTP/2 CONNECT tunnels. A peer that reads slowly while data is written quickly causes unbounded per-stream buffering and out-of-memory termination of the server. The fix returns Poll::Pending when capacity is unavailable, restoring the flow-control backpressure chain.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and are using hyper's HTTP/2 support with upgraded streams such as CONNECT tunnels.
Background info
hyper is vulnerable to Denial of Service (DoS) in versions 1.0.0 - 1.10.1.
How to fix this
Upgrade the hyper library to the patch version.
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