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CVE Vulnerability Details :
CVE-2026-21435
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-12 Feb, 2026 | 18:22
Updated At-12 Feb, 2026 | 18:24
Rejected At-
▼CVE Numbering Authority (CNA)
webtransport-go CloseWithError can block indefinitely

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 Products
Vendor
quic-go
Product
webtransport-go
Versions
Affected
  • < 0.10.0
Problem Types
TypeCWE IDDescription
CWECWE-400CWE-400: Uncontrolled Resource Consumption
Type: CWE
CWE ID: CWE-400
Description: CWE-400: Uncontrolled Resource Consumption
Metrics
VersionBase scoreBase severityVector
3.15.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/quic-go/webtransport-go/security/advisories/GHSA-px4r-g4p3-hhqv
x_refsource_CONFIRM
https://github.com/quic-go/webtransport-go/releases/tag/v0.10.0
x_refsource_MISC
Hyperlink: https://github.com/quic-go/webtransport-go/security/advisories/GHSA-px4r-g4p3-hhqv
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/quic-go/webtransport-go/releases/tag/v0.10.0
Resource:
x_refsource_MISC
Details not found