CVE-2026-123556
MEDIUM
NVD
CVSS Score
5.3
Severity
MEDIUM
Published
Nov 08, 2026
Vendor
unknown
Description
ZcashFoundation Zebra from 4.5.0 before 7.0.0 contains a protection mechanism failure that bans honest peers by scoring mempool lock-time rejections at the ban threshold. Attackers can broadcast transactions locked until the current height right after each block, causing lagging nodes to ban honest relaying peers for 24 hours or until restart.