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CVE-2026-21435

nvd nist
Published: Feb 12, 2026Modified: Feb 19, 2026

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7.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability: 3.9 / Impact: 3.6
Source: NVD

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.

Affected (1)

Quic Go
1 product
Webtransport Go
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Webtransport Go
Before 0.10.0

Related CWEs

CWE-400
Uncontrolled Resource Consumption
The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

References (2)

Source: security-advisories@github.com
ProductRelease Notes
Source: security-advisories@github.com
Vendor Advisory

Timeline

No history available yet.