CVE-2026-52734

ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, an unauthenticated P2P peer can cause the mempool download pipeline to retain transactions after verification reaches the outer RATE_LIMIT_DELAY timeout. In zebrad/src/components/mempool/downloads.rs, Downloads::poll_next removed cancel_handles entries after success and ordinary verification errors, but tokio::time::error::Elapsed did not carry the UnminedTxId needed to remove the timed-out entry. Each retained cancel_handles entry could hold a full Gossip::Tx(UnminedTx), while normal mined-transaction cleanup could not match attacker transactions and no periodic garbage collection or count cap existed. Sustained traffic therefore caused monotonic memory growth until swap pressure degraded the node or the operating system terminated the zebrad process for exhausting memory. This issue is fixed in version 4.5.0.

• CWE-401

• https://github.com/ZcashFoundation/zebra/commit/1440b43ca7df59aca948090d45117557b217a6cd
• https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0
• https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-65jj-fmw8-468q

Published

Aug 18, 2026

Last Modified

Sep 9, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-52727lxc-ci contains continuous integration and image-build scrip…7.2
• CVE-2026-5273Use after free in CSS in Google Chrome prior to 146.0.7680.1…6.3
• CVE-2026-52730Xibo is an open source digital signage platform with a web c…4.3
• CVE-2026-52731ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5…6.5
• CVE-2026-52732ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5…5.3
• CVE-2026-52733ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5…6.5
• CVE-2026-52735ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5…9.3
• CVE-2026-52736ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5…8.7
• CVE-2026-52737ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5…5.3
• CVE-2026-52738ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5…6.9
• CVE-2026-52739ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5…5.9
• CVE-2026-5274Integer overflow in Codecs in Google Chrome prior to 146.0.7…8.8