CVE-2026-21435

MEDIUM

Quic-go Webtransport-go < 0.10.0 - Denial of Service

Title source: rule
STIX 2.1

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 (2)

Scores

CVSS v3 5.3
EPSS 0.0002
EPSS Percentile 5.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-400
Status published
Products (2)
quic-go/webtransport-go < 0.10.0
quic-go/webtransport-go 0 - 0.10.0Go
Published Feb 12, 2026
Tracked Since Feb 18, 2026