CVE-2026-52732 - ZEBRA: Mempool transaction admission denial via single-peer inbound queue saturation

CVE-2026-52732 - ZEBRA: Mempool transaction admission denial via single-peer inbound queue saturation

https://cvefeed.io/rssfeed/latest.atom / Tue, 08/18/2026 - 22:27
CVE ID :CVE-2026-52732
Published : Aug. 18, 2026, 7:26 p.m. | 34 minutes ago
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.
Severity: 0.0 | NA
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