CVE-2026-73568 - py-libp2p: yamux connection DoS via oversized data frame

CVE-2026-73568 - py-libp2p: yamux connection DoS via oversized data frame

https://cvefeed.io/rssfeed/latest.atom / Thu, 08/13/2026 - 22:26
CVE ID :CVE-2026-73568
Published : Aug. 13, 2026, 6:18 p.m. | 1 hour, 10 minutes ago
Description :py-libp2p is the Python implementation of the libp2p networking stack. In 0.7.0 and earlier, the yamux handle_incoming() method in libp2p/stream_muxer/yamux/yamux.py reads an attacker-controlled 32-bit DATA frame length with read_exactly() before validating it against MAX_WINDOW_SIZE or checking whether stream_id exists. A peer that completes the standard Noise handshake can send a 12-byte frame declaring a 0xFFFFFFFF body and then withhold the body, causing the sequential yamux read loop used by the default new_host() configuration to block and preventing every stream on that connection from making progress. No fixed version is available as of this review.
Severity: 7.5 | HIGH
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