{"id":"EUVD-2026-61171","revision":"0d1d7c6a7eb840248ca9ca7e56fae8b4","records":[{"revision":"0d1d7c6a7eb840248ca9ca7e56fae8b4","observedAt":"2026-11-03T10:04:44.85+00:00","statement":{"source":"euvd","id":"EUVD-2026-61171","aliases":["CVE-2026-52736","GHSA-4m69-67m6-prqp"],"title":"ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, a remote unauthenticated P2P peer can stall a Zebra node by racing an invalid block body against the valid canonical body for the same block header hash. ZIP-244 permits the at…","description":"ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, a remote unauthenticated P2P peer can stall a Zebra node by racing an invalid block body against the valid canonical body for the same block header hash. ZIP-244 permits the attacker to mutate coinbase scriptSig authentication data while retaining the transaction identifiers, merkle root, and block header hash, so the poisoned body fails later commitment validation but shares the canonical hash. In zebra-state/src/service.rs, queue_and_commit_to_non_finalized_state recorded the hash in non_finalized_block_write_sent_hashes before contextual validation completed and did not remove it when the write task rejected the body. When the honest body later arrived, the cached hash caused KnownBlock::WriteChannel duplicate handling to suppress it, leaving the node stuck one height behind until restart or reorganization. This issue is fixed in version 4.5.0.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","score":8.7,"severity":null}],"references":["https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-4m69-67m6-prqp","https://github.com/ZcashFoundation/zebra/commit/1440b43ca7df59aca948090d45117557b217a6cd","https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-61171","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Aug 18, 2026, 7:26:40 PM","dateUpdated":"Aug 18, 2026, 7:38:44 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-61171","identifiers":["EUVD-2026-61171","CVE-2026-52736","GHSA-4m69-67m6-prqp"]},"retained":false,"historicalAffected":[]}],"coverage":[]}