{"id":"CVE-2026-40880","revision":"90b1b78bbaab406fa5c4cfd172ed9497","records":[{"revision":"90b1b78bbaab406fa5c4cfd172ed9497","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-40880","aliases":[],"title":"Zebra: Cached Mempool Verification Bypasses Consensus Rules for Ahead-of-Tip Blocks","description":"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.","state":0,"publishedAt":"2026-04-21T19:18:22.657+00:00","modifiedAt":"2026-04-21T19:52:58.88+00:00","affected":[{"ecosystem":"Vendor product","name":"zebrad","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"ZcashFoundation\",\n                    \"product\": \"zebrad\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 4.3.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"zebra-consensus","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"ZcashFoundation\",\n                    \"product\": \"zebra-consensus\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 5.0.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":7.2,"severity":"HIGH"}],"references":["https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-xvj8-ph7x-65gf"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-40880","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-40880","identifiers":["CVE-2026-40880"]},"retained":false,"historicalAffected":[]}],"coverage":[]}