CVE-2026-52739

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{"affected": [{"affectedData": [{"product": "zebra", "vendor": "ZcashFoundation", "versions": [{"status": "affected", "version": "< 4.5.0"}]}, {"product": "zebra-state", "vendor": "ZcashFoundation", "versions": [{"status": "affected", "version": "< 7.0.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, a malicious block producer can terminate zebrad by placing the same shielded transaction in a non-finalized parent block and its child. In zebra-state/src/service/non_finalized_state/chain.rs, Chain::push originally inserted the transaction hash into tx_loc_by_hash and asserted uniqueness before updating shielded data and running the duplicate Sprout, Sapling, or Orchard nullifier checks. The repeated transaction therefore reached the transactions must be unique within a single chain assertion before contextual validation could reject it cleanly. Zebra release builds use panic equals abort, so the reachable assertion terminates the entire process; exploitation requires either two consecutive attacker-mined blocks or an attacker-mined child immediately after an honest block includes the attacker's shielded transaction. This issue is fixed in version 4.5.0."}, {"lang": "es", "value": "ZEBRA es un nodo Zcash escrito completamente en Rust. Antes de la versi\u00f3n 4.5.0, un productor de bloques malicioso puede terminar zebrad al colocar la misma transacci\u00f3n blindada en un bloque padre no finalizado y su hijo. En zebra-state/src/service/non_finalized_state/chain.rs, Chain::push originalmente insertaba el hash de la transacci\u00f3n en tx_loc_by_hash y afirmaba la unicidad antes de actualizar los datos blindados y ejecutar las comprobaciones de nulificador duplicado de Sprout, Sapling u Orchard. La transacci\u00f3n repetida, por lo tanto, alcanzaba la aserci\u00f3n \u2019las transacciones deben ser \u00fanicas dentro de una sola cadena\u2019 antes de que la validaci\u00f3n contextual pudiera rechazarla limpiamente. Las compilaciones de lanzamiento de Zebra usan panic igual a abortar, por lo que la aserci\u00f3n alcanzable termina todo el proceso; la explotaci\u00f3n requiere o dos bloques consecutivos minados por el atacante o un hijo minado por el atacante inmediatamente despu\u00e9s de que un bloque honesto incluya la transacci\u00f3n blindada del atacante. Este problema est\u00e1 solucionado en la versi\u00f3n 4.5.0."}], "id": "CVE-2026-52739", "lastModified": "2026-11-09T20:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-52739", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-19T18:03:57.639095Z", "version": "2.0.3"}}]}, "published": "2026-08-18T20:17:18.127", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/ZcashFoundation/zebra/commit/1440b43ca7df59aca948090d45117557b217a6cd"}, {"source": "security-advisories@github.com", "url": "https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-hhm7-qrv5-h4r6"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-248"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.5.0)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "zebra", "source": "cna", "vendor": "ZcashFoundation"}, "product": "zebra", "vendor": "zcashfoundation"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,7.0.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "zebra-state", "source": "cna", "vendor": "ZcashFoundation"}, "product": "zebra-state", "vendor": "zcashfoundation"}], "created": "2026-08-18T20:45:04.514557+00:00", "updated": "2026-08-21T21:17:27.526410+00:00", "vendors": ["zcashfoundation", "zcashfoundation$PRODUCT$zebra", "zcashfoundation$PRODUCT$zebra-state"]}