{"id":"CVE-2026-34377","aliases":["GHSA-3vmh-33xr-9cqh"],"url":"https://o3.security/vulnerability/CVE-2026-34377","summary":"Zebra has a Consensus Failure due to Improper Verification of V5 Transactions","details":"ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-consensus version 5.0.1, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By matching a valid transaction's txid while providing invalid authorization data, 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 would not allow invalid transactions to be accepted but could result in a consensus split between vulnerable Zebra nodes and invulnerable Zebra and Zcashd nodes. This issue has been patched in zebrad version 4.3.0 and zebra-consensus version 5.0.1.","published":"2026-03-31T14:05:59.959Z","modified":"2026-08-07T11:48:55.144514064Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"zebrad","fixedVersion":"4.3.0"},{"ecosystem":"crates.io","name":"zebra-consensus","fixedVersion":"5.0.1"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0"},{"type":"WEB","url":"https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34377.json"},{"type":"ADVISORY","url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34377"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:48:55.144514064Z"}}