{"cve":"CVE-2026-73568","nvd":{"published":"2026-08-13T18:18:19.547","modified":"2026-10-24T15:10:00.190","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400"],"references":["https://github.com/libp2p/py-libp2p/commit/146ea87d1a20cc7dacf684ecf7c204543be04b37","https://github.com/libp2p/py-libp2p/security/advisories/GHSA-hmj8-5xmh-5573","https://github.com/libp2p/py-libp2p/security/advisories/GHSA-hmj8-5xmh-5573"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:35.584907681+00:00"},"epss":{"cve":"CVE-2026-73568","score":0.00488,"percentile":0.41699,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-hmj8-5xmh-5573","url":"https://osv.dev/vulnerability/GHSA-hmj8-5xmh-5573","summary":"libp2p: yamux connection DoS via oversized data frame","modified":"2026-08-19T12:56:02.295256508Z","packages":[{"ecosystem":"PyPI","name":"libp2p","purl":"pkg:pypi/libp2p","ranges":["<=0.7.0"],"fixed":[]}]},{"id":"PYSEC-2026-3681","url":"https://osv.dev/vulnerability/PYSEC-2026-3681","summary":"libp2p: yamux connection DoS via oversized data frame","modified":"2026-08-19T12:45:08.459379771Z","packages":[{"ecosystem":"PyPI","name":"libp2p","purl":"pkg:pypi/libp2p","ranges":["<=0.7.0"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}