CVE-2026-123560

HIGH 7.5

Zebra before 7.0.0 Sync Denial of Service via Forged Checkpoint Block Body

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

Zebra before 7.0.0 contains an incomplete cleanup vulnerability that allows unauthenticated peers to stall initial sync by serving a forged checkpoint block body. Attackers can supply a body with forged authorizing data near the final checkpoint, leaving rejected hashes in the sent-hash set so the node stops requesting blocks until restart.

CWE	CWE-459
Vendor	zcashfoundation
Product	zebra
Published	Nov 8, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

ZcashFoundation / zebra

0 < 7.0.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-9hq5-pfgc-cx5h vulncheck.com: https://www.vulncheck.com/advisories/zebra-before-7.0.0-sync-denial-of-service-via-forged-checkpoint-block-body

Credits

🔍 saxenism oxarbitrage mpguerra