CVE-2026-73568

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{"affected": [{"affectedData": [{"product": "py-libp2p", "vendor": "libp2p", "versions": [{"status": "affected", "version": "<= 0.7.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "py-libp2p es la implementaci\u00f3n en Python de la pila de red libp2p. En la versi\u00f3n 0.7.0 y anteriores, el m\u00e9todo yamux handle_incoming() en libp2p/stream_muxer/yamux/yamux.py lee una longitud de trama DATA de 32 bits controlada por el atacante con read_exactly() antes de validarla contra MAX_WINDOW_SIZE o de comprobar si stream_id existe. Un par que completa el handshake Noise est\u00e1ndar puede enviar una trama de 12 bytes declarando un cuerpo 0xFFFFFFFF y luego retener el cuerpo, lo que hace que el bucle de lectura secuencial de yamux utilizado por la configuraci\u00f3n predeterminada de new_host() se bloquee e impida que cada flujo en esa conexi\u00f3n avance. No hay una versi\u00f3n corregida disponible a partir de esta revisi\u00f3n."}], "id": "CVE-2026-73568", "lastModified": "2026-10-24T15:10:00.190", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-73568", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-13T18:06:28.668080Z", "version": "2.0.3"}}]}, "published": "2026-08-13T18:18:19.547", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/libp2p/py-libp2p/commit/146ea87d1a20cc7dacf684ecf7c204543be04b37"}, {"source": "security-advisories@github.com", "url": "https://github.com/libp2p/py-libp2p/security/advisories/GHSA-hmj8-5xmh-5573"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/libp2p/py-libp2p/security/advisories/GHSA-hmj8-5xmh-5573"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.7.0]"}}], "enrichment": {"confidence": 90.0, "confidence_source": "matching", "scores": [{"score": 90.0, "source": "matching"}]}, "original": {"product": "py-libp2p", "source": "cna", "vendor": "libp2p"}, "product": "libp2p", "vendor": "libp2p"}], "created": "2026-08-13T18:45:04.403955+00:00", "updated": "2026-08-14T10:00:03.913483+00:00", "vendors": ["libp2p", "libp2p$PRODUCT$libp2p"]}