Medium severity5.9NVD Advisory· Published Nov 8, 2026· Updated Nov 8, 2026

CVE-2026-123557

Description

ZcashFoundation Zebra zebrad before 7.0.0 contains a reachable assertion race condition that allows unauthenticated remote peers to abort the node by triggering disconnection during a blocked outbound send. Malicious peers can return empty FindBlocks or FindHeaders replies and stop reading their socket, dropping an unresolved MustUseClientResponseSender and terminating syncing nodes.

Affected products

ZcashFoundation/Zebrallm-fuzzy
Range: <7.0.0

Patches

Vulnerability mechanics

References

github.com/ZcashFoundation/zebra/security/advisories/GHSA-6v36-c42v-v98pnvd
www.vulncheck.com/advisories/zebra-zebrad-before-7.0.0-reachable-assertion-dos-via-peer-disconnectionnvd

News mentions

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