quic-go webtransport-go up to 0.11.0 Capsule Parsing session.go Session.parseNextCapsule allocation of resources

Summaryinfo

A vulnerability was found in quic-go webtransport-go up to 0.11.0. It has been classified as problematic. Affected is the function Session.parseNextCapsule of the file session.go of the component Capsule Parsing. Performing a manipulation results in allocation of resources. This vulnerability is identified as CVE-2026-57497. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in quic-go webtransport-go up to 0.11.0. It has been classified as problematic. This affects the function Session.parseNextCapsule of the file session.go of the component Capsule Parsing. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. The summary by CVE is:

webtransport-go is an implementation of the WebTransport protocol. Prior to 0.11.1, Session.parseNextCapsule() in session.go skips an unknown WebTransport capsule on the HTTP/3 request stream by calling io.ReadAll on the capsule reader, retaining the complete declared capsule body in memory. A malicious peer can send a large unknown capsule and cause a client or server to allocate memory for the full payload; QUIC flow control does not bound the total retained allocation because reading advances the flow-control window while the received bytes remain in memory. The resulting memory and resource exhaustion can disrupt or crash the affected process. This issue is fixed in version 0.11.1.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-57497 since 06/24/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 0.11.1 eliminates this vulnerability.

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Productinfo

Vendor

• quic-go

Name

• webtransport-go

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11.0

Website

• Product: https://github.com/quic-go/webtransport-go/

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