CVE-2026-21435 — webtransport-go CloseWithError can block indefinitely
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 d…
Published: 2026-02-12 · CVSS: 5.3 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7