AIKIDO-2026-276129
qh3 is vulnerable to Denial of Service (DoS)
53
Medium Risk
This Affects:
qh3TL;DR
The Rust QUIC header protection code in qh3 slices a sample of fixed length from an incoming packet without first verifying the packet is long enough. When a corrupted or truncated datagram is fed into the QUIC state machine, the out-of-bounds slice raises an unhandled panic that surfaces as an unexpected crash instead of a graceful error. A remote peer can trigger this by sending a short/malformed packet, disrupting availability of the QUIC/HTTP3 endpoint. The fix adds an explicit length check in src/hpk.rs and returns a CryptoError instead of crashing.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
qh3 is vulnerable to Denial of Service (DoS) in versions 1.4.5 - 1.7.3.
How to fix this
Upgrade the qh3 library to the patch version.
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