Zebra before 6.3.0 Honest Peer Banning via Far-Ahead FindBlocks Hashes

{
  "id": "8c614f4e9cf60eef3dbb6ea842503da51f66f1d479b72eed984a4f1358367191",
  "url": "https://osv.dev/vulnerability/CVE-2026-104419",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Zebra before 6.3.0 Honest Peer Banning via Far-Ahead FindBlocks Hashes",
    "summary": "Zebra (zebrad) 4.5.0 before 6.3.0 discards which peer supplied the block hashes in FindBlocks responses, then assigns 100 misbehavior points, the ban threshold, to whichever peer serves a requested block more than 50,000 heights above the tip. A remote peer can return real far-ahead hashes to a syncing node so that honest peers get banned, eroding its peer set and raising eclipse risk.",
    "evidence": "osv:CVE-2026-104419",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-104419",
      "aliases": [
        "CVE-2026-104419",
        "GHSA-qhr3-cvch-5fh2"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/zcashfoundation/zebra",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1440b43ca7df59aca948090d45117557b217a6cd"
                },
                {
                  "fixed": "f5c5277fe41eba9c74f37098738f93f35dd70d60"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "6.3.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "4.5.0"
                      },
                      {
                        "fixed": "6.3.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "zebra-utils-v10.0.0",
            "zebra-state-v12.0.1",
            "zebra-script-v10.1.2",
            "zebra-rpc-v15.0.0",
            "zebra-node-services-v9.1.2",
            "zebra-network-v11.0.0",
            "zebra-consensus-v14.0.1",
            "zebra-chain-v11.3.0",
            "v6.2.3",
            "zebra-utils-v9.1.4",
            "zebra-state-v12.0.0",
            "zebra-rpc-v14.0.0",
            "zebra-network-v10.2.1",
            "zebra-consensus-v14.0.0",
            "v6.2.2",
            "zebra-utils-v9.1.3",
            "zebra-state-v11.1.1",
            "zebra-rpc-v13.0.0",
            "zebra-consensus-v13.0.0",
            "v6.2.1",
            "zebra-state-v11.1.0",
            "zebra-network-v10.2.0",
            "zebra-consensus-v12.0.1",
            "v6.2.0",
            "zebra-utils-v9.1.1",
            "zebra-state-v11.0.0",
            "zebra-script-v10.1.1",
            "zebra-rpc-v12.0.0",
            "zebra-node-services-v9.1.1",
            "zebra-network-v10.1.1",
            "zebra-consensus-v12.0.0",
            "zebra-chain-v11.2.0",
            "v6.1.0",
            "tower-fallback-v0.2.43",
            "tower-batch-control-v1.1.1",
            "zebra-utils-v9.1.0",
            "zebra-state-v10.1.0",
            "zebra-script-v10.1.0",
            "zebra-rpc-v11.1.0",
            "zebra-node-services-v9.1.0",
            "zebra-network-v10.1.0",
            "zebra-consensus-v11.0.0",
            "zebra-chain-v11.1.0",
            "v6.0.0",
            "tower-fallback-v0.2.42",
            "tower-batch-control-v1.1.0",
            "v6.0.0-rc.0",
            "v5.2.0",
            "v5.1.0",
            "v5.1.1",
            "v5.0.0",
            "v4.5.1",
            "v4.5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-104419.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.510774255Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104419.json",
        "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-qhr3-cvch-5fh2",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-104419",
        "https://www.vulncheck.com/advisories/zebra-before-6.3.0-honest-peer-banning-via-far-ahead-findblocks-hashes"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-345"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104419.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-104419",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505687,
  "published_at": "2026-10-02T11:38:01.103+00:00"
}