{"id":"CVE-2026-34377","state":"PUBLISHED","title":"Zebra has a Consensus Failure due to Improper Verification of V5 Transactions","description":"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.","publishedAt":"2026-03-31T14:05:59.959Z","updatedAt":"2026-03-31T17:18:12.932Z","severity":{"score":8.4,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["ZcashFoundation zebra","ZcashFoundation zebra-consensus"],"affected":[{"vendor":"ZcashFoundation","product":"zebra","versions":[{"version":"< 4.3.0","status":"affected"}]},{"vendor":"ZcashFoundation","product":"zebra-consensus","versions":[{"version":"< 5.0.1","status":"affected"}]}],"references":["https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh","https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0","https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements"],"weaknesses":["CWE-347"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/34xxx/CVE-2026-34377.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-34377","state":"PUBLISHED","datePublished":"2026-03-31T14:05:59.959Z","dateUpdated":"2026-03-31T17:18:12.932Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-27T13:43:14.370Z"},"containers":{"cna":{"title":"Zebra has a Consensus Failure due to Improper Verification of V5 Transactions","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"ZcashFoundation","product":"zebra","versions":[{"version":"< 4.3.0","status":"affected"}]},{"vendor":"ZcashFoundation","product":"zebra-consensus","versions":[{"version":"< 5.0.1","status":"affected"}]}],"references":[{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh","name":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0","name":"https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0","tags":["x_refsource_MISC"]},{"url":"https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements","name":"https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"HIGH","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"HIGH","subAvailabilityImpact":"HIGH","baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-347","lang":"en","description":"CWE-347: Improper Verification of Cryptographic Signature","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-31T14:05:59.959Z"},"source":{"advisory":"GHSA-3vmh-33xr-9cqh","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-31T17:18:05.262524Z","id":"CVE-2026-34377","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-31T17:18:12.932Z"}}]}}}