CVE-2026-44500

{"id": "CVE-2026-44500", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-44500", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-08T19:41:23.974951Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "ZcashFoundation", "product": "zebra", "versions": [{"status": "affected", "version": "zebrad < 4.4.0"}, {"status": "affected", "version": "zebra-chain < 7.0.0"}, {"status": "affected", "version": "zebra-network < 6.0.0"}]}]}], "published": "2026-05-08T15:17:01.777", "references": [{"url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-438q-jx8f-cccv", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.4.0, prior to zebra-chain version 7.0.0, and prior to zebra-network version 6.0.0, several inbound deserialization paths in Zebra allocated buffers sized against generic transport or block-size ceilings before the tighter protocol or consensus limits were enforced. An unauthenticated or post-handshake peer could therefore force the node to preallocate and parse for orders of magnitude more data than the protocol intended, across headers messages, equihash solutions in block headers, Sapling spend vectors in V5/V4 transactions, and coinbase script bytes in blocks. This issue has been patched in zebrad version 4.4.0, zebra-chain version 7.0.0, and zebra-network version 6.0.0."}, {"lang": "es", "value": "ZEBRA es un nodo de Zcash escrito completamente en Rust. Antes de la versi\u00f3n 4.4.0 de zebrad, antes de la versi\u00f3n 7.0.0 de zebra-chain, y antes de la versi\u00f3n 6.0.0 de zebra-network, varias rutas de deserializaci\u00f3n entrantes en Zebra asignaban b\u00faferes dimensionados contra l\u00edmites m\u00e1ximos gen\u00e9ricos de transporte o de tama\u00f1o de bloque antes de que se aplicaran los l\u00edmites m\u00e1s estrictos del protocolo o del consenso. Un par no autenticado o posterior al handshake podr\u00eda, por lo tanto, forzar al nodo a preasignar y analizar \u00f3rdenes de magnitud m\u00e1s datos de lo que el protocolo pretend\u00eda, a trav\u00e9s de mensajes de cabeceras, soluciones equihash en cabeceras de bloque, vectores de gasto Sapling en transacciones V5/V4, y bytes de script de coinbase en bloques. Este problema ha sido parcheado en la versi\u00f3n 4.4.0 de zebrad, la versi\u00f3n 7.0.0 de zebra-chain, y la versi\u00f3n 6.0.0 de zebra-network."}], "lastModified": "2026-10-26T18:10:00.173", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:zfnd:zebra-chain:*:*:*:*:*:rust:*:*", "vulnerable": true, "matchCriteriaId": "6BF3BDC0-FD8D-4265-B8BC-139BF28710E2", "versionEndExcluding": "7.0.0"}, {"criteria": "cpe:2.3:a:zfnd:zebra-network:*:*:*:*:*:rust:*:*", "vulnerable": true, "matchCriteriaId": "8E807203-EE55-46B2-8CD1-29047653BCFF", "versionEndExcluding": "6.0.0"}, {"criteria": "cpe:2.3:a:zfnd:zebrad:*:*:*:*:*:rust:*:*", "vulnerable": true, "matchCriteriaId": "23232F98-CB60-4B90-B46A-430E3E1CE10B", "versionEndExcluding": "4.4.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}