CVE-2026-32314 — Yamux remote Panic via malformed Data frame with SYN set and len = 262145

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
libp2p / rust-yamux	affected < 0.13.10

CWE

CWE-248

References

https://github.com/libp2p/rust-yamux/security/advisories/GHSA-vxx9-2994-q338

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.