{"id":"CVE-2026-123556","aliases":[],"cve":{"records":[{"id":"CVE-2026-123556","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-11-06T00:50:45.483Z","published":"2026-11-08T01:37:58.283Z","modified":"2026-11-12T12:57:04.693Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-11-08T01:37:58.283Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-11-12T12:57:04.693Z"}],"references":[{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-5h3r-fpmj-483w","tags":["vendor-advisory"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/zebra-4.5.0-before-7.0.0-honest-peer-ban-via-mempool-lock-time-scoring","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-693","description":"Protection Mechanism Failure","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:*","versionStartIncluding":"4.5.0","versionEndExcluding":"7.0.0"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-11-12T12:56:50.326321Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"title":"Zebra 4.5.0 before 7.0.0 Honest Peer Ban via Mempool Lock-Time Scoring","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"ZcashFoundation Zebra from 4.5.0 before 7.0.0 contains a protection mechanism failure that bans honest peers by scoring mempool lock-time rejections at the ban threshold. Attackers can broadcast transactions locked until the current height right after each block, causing lagging nodes to ban honest relaying peers for 24 hours or until restart.","score":6.9,"severity":"medium","published":"2026-11-08T01:37:58.283Z","modified":"2026-11-12T12:57:04.693Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"ZcashFoundation","name":"zebra","platforms":[],"versions":[{"version":"4.5.0","status":"affected","lessThan":"7.0.0","versionType":"semver"},{"version":"7.0.0","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:cargo/zebrad","packageIdentity":{"ecosystem":"crates.io","name":"zebrad"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-123556"}],"remediation":[],"references":["https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-5h3r-fpmj-483w","https://www.vulncheck.com/advisories/zebra-4.5.0-before-7.0.0-honest-peer-ban-via-mempool-lock-time-scoring"],"sources":[{"name":"CVE","id":"CVE-2026-123556","modified":"2026-11-12T12:57:04.693Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-123556"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","score":6.9},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3}],"sourceAffected":[],"observedAt":"2026-11-12T20:12:02.218Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T00:55:33.128Z"},"coverage":[{"source":"NVD","status":"refresh-failed","attemptedAt":"2026-11-08T03:05:40.768Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-11-08T03:05:32.794Z","attemptedAt":"2026-11-08T03:05:32.794Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-08T03:05:33.491Z","attemptedAt":"2026-11-08T03:05:33.491Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-11-08T03:05:32.966Z","attemptedAt":"2026-11-08T03:05:32.966Z"}],"evidence":[{"source":"ENISA EUVD","id":"EUVD-2026-119441","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-119441","modified":"Nov 8, 2026, 1:37:58 AM","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","checkedAt":"2026-11-08T03:05:33.491Z"}],"aiSummary":{"text":"Zebra versions 4.5.0 before 7.0.0 contain a protection mechanism failure, allowing attackers to ban honest peers by broadcasting transactions, causing 24-hour bans. Attackers need access to the network to broadcast transactions. The weakness is a protection mechanism failure.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-11-08T02:21:06.342Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-123556"}]}}