{"id":"CVE-2026-123560","title":"Zebra before 7.0.0 Sync Denial of Service via Forged Checkpoint Block Body","summary":"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 ch…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-459"],"vendor":"ZcashFoundation","product":"zebra","affected":["zebra < 7.0.0"],"published":"2026-11-08","updated":"2026-11-08","sourceUpdated":"2026-11-08T01:38:01.040Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123560","references":[{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-9hq5-pfgc-cx5h","label":"GitHub Security Advisory (GHSA-9hq5-pfgc-cx5h)"},{"url":"https://www.vulncheck.com/advisories/zebra-before-7.0.0-sync-denial-of-service-via-forged-checkpoint-block-body","label":"VulnCheck Advisory: Zebra before 7.0.0 Sync Denial of Service via Forged Checkpoint Block Body"}],"tags":["cve.org"],"ingestedAt":"2026-11-08T02:43:18.664Z","slug":"CVE-2026-123560","body":"## Overview\n\nZebra 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.\n\n## Affected\n\n- `zebra < 7.0.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}