Detections
Analytics
CVE-2026-21435
medium
Description
webtransport-go is an implementation of the WebTransport protocol. Prior to v0.10.0, an attacker can cause a denial of service in webtransport-go by preventing or indefinitely delaying WebTransport session closure. A malicious peer can withhold QUIC flow control credit on the CONNECT stream, blocking transmission of the WT_CLOSE_SESSION capsule and causing the close operation to hang. This vulnerability is fixed in v0.10.0.
References
https://github.com/quic-go/webtransport-go/security/advisories/GHSA-px4r-g4p3-hhqv
https://github.com/quic-go/webtransport-go/releases/tag/v0.10.0