{"apiVersion":"1.0","identifier":"CVE-2026-52732","description":"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.","publishedAt":"2026-08-18T20:17:16","lastModifiedAt":"2026-08-18T20:17:16","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-52732","cvssScore":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","epssProbability":0.00371,"riskScore":0.55,"affectedProduct":"Zebra","affectedVersions":"<4.5.0","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-52732","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-52732","en":"https://www.redsauce.net/en/cves/CVE-2026-52732","fr":"https://www.redsauce.net/fr/cves/CVE-2026-52732","pt":"https://www.redsauce.net/pt/cves/CVE-2026-52732","de":"https://www.redsauce.net/de/cves/CVE-2026-52732","sk":"https://www.redsauce.net/sk/cves/CVE-2026-52732","el":"https://www.redsauce.net/el/cves/CVE-2026-52732"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-52732"}}