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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.13.0,0.13.9)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "rust-yamux", "source": "cna", "vendor": "libp2p"}, "product": "rust-yamux", "vendor": "libp2p"}], "analysis": {"en": {"generated_at": "2026-03-19T16:06:57.193893+00:00", "value": {"mitigation_remediation": ["Update libp2p:rust-yamux to version 0.13.9 or later; this release fixes the arithmetic overflow in WindowUpdate handling.", "If an immediate upgrade is not feasible, isolate the affected services behind a firewall or network filter that rejects or drops malformed WindowUpdate packets, and monitor for suspicious traffic patterns."], "summary": {"action": "Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the libp2p:rust-yamux package versions ranging from 0.13.0 up to but not including 0.13.9. The specific CPE identifier is cpe:2.3:a:protocol:yamux:*:*:*:*:*:rust:*:*.", "description_and_impact": "Yamux, a stream multiplexer built over TCP/IP, has a flaw in sending window accounting that can be triggered by a specially crafted WindowUpdate packet. The arithmetic overflow causes a panic in the connection state machine, resulting in a crash of the affected process. This vulnerability is exploitable remotely via a normal network connection and does not require authentication, leading to a denial of service for any application using the vulnerable library.", "risk_and_exploitability": "The CVSS score of 8.7 classifies this as a high severity issue. The EPSS score of less than 1% indicates a low overall probability of exploitation, and the vendor has not listed it in the CISA Known Exploited Vulnerabilities catalog. Exploitation requires only the ability to send a maliciously crafted WindowUpdate over a network connection to the target. Successful exploitation results in a program crash, causing denial of service for the affected process and potentially impacting connected peers. The vulnerability is exploitable without credentials and can be delivered over any active TCP/IP session that uses Yamux."}}}}, "created": "2026-03-16T09:24:20.106798+00:00", "updated": "2026-03-23T13:40:14.861835+00:00", "vendors": ["libp2p", "libp2p$PRODUCT$rust-yamux"]}