{"id":"CVE-2026-123558","title":"Zebra before 7.0.0 Checkpoint Sync Denial of Service via Cancelled Verifier Rewind","summary":"Zebra zebrad before 7.0.0 contains a denial of service vulnerability that allows a malicious peer to stall checkpoint sync by cancelling the verifier rewind after a failed commit. Attackers can serve a forged block with altered authorizi…","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-460"],"vendor":"ZcashFoundation","product":"zebra","affected":["zebra < 7.0.0"],"published":"2026-11-08","updated":"2026-11-08","sourceUpdated":"2026-11-08T01:37:59.650Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123558","references":[{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-2w9f-9wx8-f5c8","label":"GitHub Security Advisory (GHSA-2w9f-9wx8-f5c8)"},{"url":"https://www.vulncheck.com/advisories/zebra-before-7.0.0-checkpoint-sync-denial-of-service-via-cancelled-verifier-rewind","label":"VulnCheck Advisory: Zebra before 7.0.0 Checkpoint Sync Denial of Service via Cancelled Verifier Rewind"}],"tags":["cve.org"],"ingestedAt":"2026-11-08T02:43:18.666Z","slug":"CVE-2026-123558","body":"## Overview\n\nZebra zebrad before 7.0.0 contains a denial of service vulnerability that allows a malicious peer to stall checkpoint sync by cancelling the verifier rewind after a failed commit. Attackers can serve a forged block with altered authorizing data plus a restart-triggering block, leaving the verifier rejecting honest 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":[]}