Cloudanix VulnDB

CVE-2026-73568

High · 7.5

CVSS

7.5

EPSS

0.5%

Published

Aug 13, 2026

CISA due date

—

The record

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.

Affected packages

Ecosystem Package Introduced Fixed

Related vulnerabilities