CVE-2026-21435 | THREATINT

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.

PUBLISHED Reserved 2025-12-29 | Published 2026-02-12 | Updated 2026-02-17 | Assigner GitHub_M

MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem types

CWE-400: Uncontrolled Resource Consumption

Product status

< 0.10.0

affected

References

github.com/...ort-go/security/advisories/GHSA-px4r-g4p3-hhqv

github.com/quic-go/webtransport-go/releases/tag/v0.10.0

cve.org (CVE-2026-21435)

nvd.nist.gov (CVE-2026-21435)

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