CVE-2026-52732

{"id": "CVE-2026-52732", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-52732", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-18T19:32:12.651849Z"}}], "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": "< 4.5.0"}]}]}], "published": "2026-08-18T20:17:16.710", "references": [{"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-4fc2-h7jh-287c", "source": "security-advisories@github.com"}, {"url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-4fc2-h7jh-287c", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Primary", "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 4.5.0, one unauthenticated P2P peer can monopolize all 25 MAX_INBOUND_CONCURRENCY slots in Zebra's inbound mempool download and verification pipeline. In zebrad/src/components/mempool/downloads.rs, the bounded queue was shared globally without per-peer accounting, while peer identity was not carried through Gossip and FullQueue responses were mapped to Response::Nil instead of reaching overload disconnection handling. An attacker can advertise fake transaction identifiers and remain silent so each task holds a slot until TRANSACTION_DOWNLOAD_TIMEOUT, then periodically refill the queue as slots expire. While saturated, honest peer transactions and local sendrawtransaction requests are rejected with MempoolError::FullQueue, although block validation and synchronization continue. 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 par P2P no autenticado puede monopolizar las 25 ranuras MAX_INBOUND_CONCURRENCY en la tuber\u00eda de descarga y verificaci\u00f3n de la mempool entrante de Zebra. En zebrad/src/components/mempool/downloads.rs, la cola limitada se compart\u00eda globalmente sin contabilidad por par, mientras que la identidad del par no se transmit\u00eda a trav\u00e9s de Gossip y las respuestas FullQueue se mapeaban a Response::Nil en lugar de alcanzar el manejo de desconexi\u00f3n por sobrecarga. Un atacante puede anunciar identificadores de transacci\u00f3n falsos y permanecer en silencio para que cada tarea retenga una ranura hasta TRANSACTION_DOWNLOAD_TIMEOUT, luego rellenar peri\u00f3dicamente la cola a medida que las ranuras expiran. Mientras est\u00e1 saturado, las transacciones de pares honestos y las solicitudes locales de sendrawtransaction son rechazadas con MempoolError::FullQueue, aunque la validaci\u00f3n y sincronizaci\u00f3n de bloques contin\u00faan. Este problema est\u00e1 solucionado en la versi\u00f3n 4.5.0."}], "lastModified": "2026-10-22T22:10:00.250", "sourceIdentifier": "security-advisories@github.com"}