CVE-2026-123556 · Runtime
NO FIX YET · SEE WHAT TO DO
Zebra, a Zcash node implementation, scores mempool lock-time rejections at the ban threshold, so honest relaying peers get banned. An attacker broadcasts transactions locked to the current height right after each block, causing lagging nodes to ban good peers for 24 hours or until restart.
first public Oct 22, 2026 · 1 source
Check it with your coding agent
It checks your repository and tells you if you’re affected, with the fix.
Operators running Zebra nodes from 4.5.0 up to but not including 7.0.0 that accept relayed transactions from peers. Nodes that are fully synced or do not relay from the public network are less exposed. Nodes running other Zcash implementations are not described by this signal.
Not affected if zebra-7.0.0-or-later, zebra-below-4.5.0
Who cares self-hosted, zcash, zebra
zebra --version or the release tag the node runs.7.0.0.4.5.0 before 7.0.0: move to 7.0.0 or later.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.
This page as .md · .json · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.
Are you affected?
Tell InfraStack what you run. It checks this one, and every next one, against your stack.
Ask from here. InfraStack checks the affected versions against your stack and answers in your inbox.
InfraStack checks the affected versions against your stack and answers in Slack, with the evidence and the fix.