Vulnerability in Libp2p Rust-Yamux
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
- Libp2p Rust-Yamux — versions < 0.13.10
- Protocol Yamux
Weakness classification (CWE)
References
- github.com/libp2p/rust-yamux/security/advisories/GHSA-vxx9-2994-q338 (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-32314?
- CVE-2026-32314 is a high-severity vulnerability in Libp2p Rust-Yamux, classified under CWE-248. CVSS score: 7.5/10. Published 2026-03-16.
- How severe is CVE-2026-32314?
- High severity. CVSS v3 base score is 7.5 out of 10.