What’s Vulnerable › Vulnerabilities
CVE-2026-32314: Yamux remote Panic via malformed Data frame with SYN set and len = 262145
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-03-16 · updated 2026-06-17
- Weakness: CWE-248
Description
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 products
- libp2p rust-yamux: before 0.13.10 — fixed in 0.13.10
How to fix
Upgrade to a fixed version: libp2p rust-yamux 0.13.10. Check the vendor advisory for mitigations.
References
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