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NVD Vulnerability Details :
CVE-2026-21435
Received
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-12 Feb, 2026 | 19:15
Updated At-12 Feb, 2026 | 19:15

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.15.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Type: Secondary
Version: 3.1
Base score: 5.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-400Primarysecurity-advisories@github.com
CWE ID: CWE-400
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/quic-go/webtransport-go/releases/tag/v0.10.0security-advisories@github.com
N/A
https://github.com/quic-go/webtransport-go/security/advisories/GHSA-px4r-g4p3-hhqvsecurity-advisories@github.com
N/A
Hyperlink: https://github.com/quic-go/webtransport-go/releases/tag/v0.10.0
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/quic-go/webtransport-go/security/advisories/GHSA-px4r-g4p3-hhqv
Source: security-advisories@github.com
Resource: N/A
Change History
0Changes found
Details not found