{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "4.3.1"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "aba329d6dca884f6d42bb4d36bda0010a071c2fc"
            }
          ],
          "repo": "https://github.com/zcashfoundation/zebra",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-xvj8-ph7x-65gf"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1025"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40880.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "5.0.2"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and zebra-consensus version 5.0.2, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By carefully submitting a transaction that is valid for height H+1 but invalid for H+2 and then mining that transaction in a block at height H+2, a miner could cause vulnerable Zebra nodes to accept an invalid block, leading to a consensus split from the rest of the Zcash network. This vulnerability is fixed in zebrad version 4.3.1 and zebra-consensus version 5.0.2.",
  "id": "CVE-2026-40880",
  "modified": "2026-07-08T05:37:56.701165192Z",
  "published": "2026-04-21T19:18:22.657Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40880.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-xvj8-ph7x-65gf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40880"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Zebra: Cached Mempool Verification Bypasses Consensus Rules for Ahead-of-Tip Blocks"
}