Medium severity5.3NVD Advisory· Published Nov 8, 2026· Updated Nov 8, 2026

CVE-2026-123556

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

ZcashFoundation/Zebrallm-fuzzy
Range: >=4.5.0,<7.0.0

Patches

Vulnerability mechanics

References

github.com/ZcashFoundation/zebra/security/advisories/GHSA-5h3r-fpmj-483wnvd
www.vulncheck.com/advisories/zebra-4.5.0-before-7.0.0-honest-peer-ban-via-mempool-lock-time-scoringnvd

News mentions

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patch	-0.070
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