CVE-2026-32314

Yamux is a stream multiplexer over reliable, ordered connections such as TCP/IP. Prior to 0.13.10, the Rust implementation of Yamux can panic when processing a crafted inbound Data frame that sets SYN and uses a body length greater than DEFAULT_CREDIT (e.g. 262145). On the first packet of a new inbound stream, stream state is created and a receiver is queued before oversized-body validation completes. When validation fails, the temporary stream is dropped and cleanup may call remove(...).expect("stream not found"), triggering a panic in the connection state machine. This is remotely reachable over a normal Yamux session and does not require authentication. This vulnerability is fixed in 0.13.10.

• CWE-248

• https://github.com/libp2p/rust-yamux/security/advisories/GHSA-vxx9-2994-q338Exploit, Vendor Advisory

Published

Mar 16, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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