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PYSEC-2026-3681 libp2p: yamux connection DoS via oversized data frame

🗓️ 19 Aug 2026 11:56:25Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 3 Views

yamux stream multiplexer in py-libp2p does not validate DATA frame length against the receive window, enabling DoS via oversized frame bodies.

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19 Aug 2026 12:45Current
5.5Medium risk
Vulners AI Score5.5
CVSS 3.17.5
EPSS0.00351
3