{"id":"CVE-2026-123557","title":"Zebra zebrad before 7.0.0 Reachable Assertion DoS via Peer Disconnection","summary":"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 emp…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-617"],"vendor":"ZcashFoundation","product":"zebra","affected":["zebra < 7.0.0"],"published":"2026-11-08","updated":"2026-11-08","sourceUpdated":"2026-11-08T01:37:58.967Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123557","references":[{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-6v36-c42v-v98p","label":"GitHub Security Advisory (GHSA-6v36-c42v-v98p)"},{"url":"https://www.vulncheck.com/advisories/zebra-zebrad-before-7.0.0-reachable-assertion-dos-via-peer-disconnection","label":"VulnCheck Advisory: Zebra zebrad before 7.0.0 Reachable Assertion DoS via Peer Disconnection"}],"tags":["cve.org"],"ingestedAt":"2026-11-08T02:43:18.665Z","slug":"CVE-2026-123557","body":"## Overview\n\nZcashFoundation 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.\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":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}