Title: ZcashFoundation, Description: ZEBRA es un nodo Zcash escrito completamente en Rust. Antes de la versión 4.3.0 de zebrad y la versión 5.0.1 de zebra-consensus, un error lógico en la caché de verificación de transacciones de Zebra podría permitir a un minero malicioso inducir una división de consenso. Al hacer coincidir el txid de una transacción válida mientras se proporcionan datos de autorización inválidos, un minero podría hacer que los nodos Zebra vulnerables aceptaran un bloque inválido, lo que llevaría a una división de consenso del resto de la red Zcash. Esto no permitiría que se aceptaran transacciones inválidas, pero podría resultar en una división de consenso entre nodos Zebra vulnerables y nodos Zebra y Zcashd invulnerables. Este problema ha sido parcheado en la versión 4.3.0 de zebrad y la versión 5.0.1 de zebra-consensus.

{"timestamp":"2026-03-31T17:18:05.262524Z","id":"CVE-2026-34377","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

[{"vendor":"ZcashFoundation","product":"zebra","versions":[{"version":"< 4.3.0","status":"affected"}]},{"vendor":"ZcashFoundation","product":"zebra-consensus","versions":[{"version":"< 5.0.1","status":"affected"}]}]

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

OR
          *cpe:2.3:a:zfnd:zebra-consensus:*:*:*:*:*:rust:*:* versions up to (excluding) 5.0.1
          *cpe:2.3:a:zfnd:zebra:*:*:*:*:*:rust:*:* versions up to (excluding) 4.3.0

GitHub, Inc.: https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0 Types: Release Notes

GitHub, Inc.: https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh Types: Exploit, Vendor Advisory

GitHub, Inc.: https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements Types: Vendor Advisory

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.

AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CWE-347

https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh

https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements