VULNERABILITY INTELLIGENCE

CVE-2026-21435

CVSS score5.3 MEDIUM
EPSS probability0.46%
CISA KEVNot currently listed
Published2026-02-12
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

Weakness classification

  • security-advisories@github.com: CWE-400

Primary references