Memory Management Vulnerability in Zcash Node by ZEBRA
CVE-2026-52734

5.3MEDIUM

Key Information:

Vendor

Zcashfoundation

Status
Zebra
Vendor
CVE Published:
18 August 2026

What is CVE-2026-52734?

A memory management issue exists in the Zcash node implementation by ZEBRA, where unauthenticated P2P peers can exploit the mempool download pipeline. Specifically, transactions may persist beyond verification, causing an increase in memory consumption without proper cleanup mechanisms. The failure of timeout handling allows exploited transactions to accumulate indefinitely, potentially leading to performance degradation or crashes under high traffic scenarios. This flaw has been addressed in version 4.5.0.

Affected Version(s)

zebra < 4.5.0

References

https://github.com/ZcashFoundation/zebra/security/advisor...
x_refsource_CONFIRM
https://github.com/ZcashFoundation/zebra/commit/1440b43ca...
x_refsource_MISC
https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0
x_refsource_MISC

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.