Medium severity5.9NVD Advisory· Published Oct 2, 2026

CVE-2026-104427

Description

Zebra before 6.1.0 contains an incomplete cleanup vulnerability in the state write task that allows remote unauthenticated peers to stall node synchronization by poisoning parent_error_map. Attackers can deliver a coinbase-malleated block sharing a canonical block's hash before it propagates, causing the next canonical block to be rejected and stalling the node for roughly 2,000 blocks.

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Affected products

ZcashFoundation/Zebrallm-fuzzy
Range: <6.1.0

Patches

Vulnerability mechanics

References

github.com/ZcashFoundation/zebra/security/advisories/GHSA-8gxx-hc65-vv82nvd
www.vulncheck.com/advisories/zebra-before-6.1.0-chain-stall-via-stale-parent-error-map-entrynvd

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cvss	0.384
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000