CVE-2026-21434 webtransport-go affected by Memory Exhaustion Attack due to Missing Length Check in WT_CLOSE_SESSION Capsule

webtransport-go is an implementation of the WebTransport protocol. From 0.3.0 to 0.9.0, an attacker can cause excessive memory consumption in webtransport-go's session implementation by sending a WTCLOSESESSION capsule containing an excessively large Application Error Message. The implementation...

CVE-2026-21434 webtransport-go affected by Memory Exhaustion Attack due to Missing Length Check in WT_CLOSE_SESSION Capsule

webtransport-go is an implementation of the WebTransport protocol. From 0.3.0 to 0.9.0, an attacker can cause excessive memory consumption in webtransport-go's session implementation by sending a WTCLOSESESSION capsule containing an excessively large Application Error Message. The implementation...

CVE-2026-21434

This CVE affects webtransport-go (versions 0.3.0 to 0.9.0). A WT_CLOSE_SESSION capsule with an oversized Application Error Message can be fully read and stored in memory due to lack of the draft-mandated 1024-byte limit, enabling memory exhaustion. The issue is fixed in version 0.10.0. Affected i...

CVE-2026-21434 webtransport-go affected by Memory Exhaustion Attack due to Missing Length Check in WT_CLOSE_SESSION Capsule

webtransport-go is an implementation of the WebTransport protocol. From 0.3.0 to 0.9.0, an attacker can cause excessive memory consumption in webtransport-go's session implementation by sending a WTCLOSESESSION capsule containing an excessively large Application Error Message. The implementation...

Improper Resource Shutdown or Release

Overview Affected versions of this package are vulnerable to Improper Resource Shutdown or Release via the CloseWithError function. An attacker can cause the process to hang indefinitely by withholding QUIC flow control credit on the CONNECT stream, which prevents the transmission of the...

webtransport-go: CloseWithError can block indefinitely

Summary 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 WTCLOSESESSION capsule and causing the close operati...

GHSA-G6X7-JQ8P-6Q9Q webtransport-go: Memory Exhaustion Attack due to Missing Length Check in WT_CLOSE_SESSION Capsule

Summary An attacker can cause excessive memory consumption in webtransport-go's session implementation by sending a WTCLOSESESSION capsule containing an excessively large Application Error Message. The implementation does not enforce the draft-mandated limit of 1024 bytes on this field, allowing ...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling due to missing length validation in the WTCLOSESESSION capsule parser. An attacker can exhaust system memory by sending a capsule with an excessively large Application Error Message...

webtransport-go 资源管理错误漏洞

webtransport-go is an open-source Go language library developed by quic-go. Versions of webtransport-go prior to 0.10.0 contained a resource management vulnerability. This vulnerability could be exploited by malicious peers that might prevent or indefinitely delay the termination of sessions,...

webtransport-go 安全漏洞

webtransport-go is an open-source Go language library developed by quic-go. Versions of webtransport-go prior to 0.10.0 contained security vulnerabilities. These vulnerabilities stemmed from the failure to remove closed streams from the internal session mapping, which could lead to unlimited memo...

PT-2026-7868

Name of the Vulnerable Software and Affected Versions webtransport-go versions 0.3.0 through 0.9.0 Description webtransport-go’s session implementation is susceptible to excessive memory consumption. An attacker can send a WT CLOSE SESSION capsule containing an excessively large Application Error...