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I. Basic Information for CVE-2026-21435
Vulnerability Information

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Vulnerability Title
webtransport-go CloseWithError can block indefinitely
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
webtransport-go 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
webtransport-go是quic-go开源的一个Go语言库。 webtransport-go 0.10.0之前版本存在资源管理错误漏洞,该漏洞源于恶意对等方可能阻止或无限期延迟会话关闭,可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
quic-gowebtransport-go < 0.10.0 -
II. Public POCs for CVE-2026-21435
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III. Intelligence Information for CVE-2026-21435
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