Vulnerability in Zcashfoundation Zebra
CVE-2026-123560
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-9hq5-pfgc-cx5h) (vendor-advisory)
- VulnCheck Advisory: Zebra before 7.0.0 Sync Denial of Service via Forged Checkpoint Block Body (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123560?
- CVE-2026-123560 is a high-severity vulnerability in Zcashfoundation Zebra, classified under Incomplete Cleanup. CVSS score: 7.5/10. Published 2026-11-08.
- How severe is CVE-2026-123560?
- High severity. CVSS v3 base score is 7.5 out of 10.