CVE-2026-21434

This CVE affects webtransport-go (versions 0.3.0 to 0.9.0). A WT_CLOSE_SESSION capsule with an oversized Application Error Message can be fully read and stored in memory due to lack of the draft-mandated 1024-byte limit, enabling memory exhaustion. The issue is fixed in version 0.10.0. Affected i...

GHSA-PX4R-G4P3-HHQV webtransport-go: CloseWithError can block indefinitely

Summary 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 WTCLOSESESSION capsule and causing the close operati...