{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-40880","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-04-15T15:57:41.719Z","datePublished":"2026-04-21T19:18:22.657Z","dateUpdated":"2026-04-21T19:52:58.880Z"},"containers":{"cna":{"title":"Zebra: Cached Mempool Verification Bypasses Consensus Rules for Ahead-of-Tip Blocks","problemTypes":[{"descriptions":[{"cweId":"CWE-1025","lang":"en","description":"CWE-1025: Comparison Using Wrong Factors","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"HIGH","subAvailabilityImpact":"HIGH","baseScore":7.2,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"}}],"references":[{"name":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-xvj8-ph7x-65gf","tags":["x_refsource_CONFIRM"],"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-xvj8-ph7x-65gf"}],"affected":[{"vendor":"ZcashFoundation","product":"zebrad","versions":[{"version":"< 4.3.1","status":"affected"}]},{"vendor":"ZcashFoundation","product":"zebra-consensus","versions":[{"version":"< 5.0.2","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-04-21T19:18:22.657Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-xvj8-ph7x-65gf","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-21T19:52:38.860835Z","id":"CVE-2026-40880","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-21T19:52:58.880Z"}}]}}