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0xCERT Security Advisory 0xCERT-2026-0224
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Advisory-ID:  0xCERT-2026-0224
Severity:     High
Published:    2026-03-30T19:13:41.000Z
Updated:      2026-10-08T22:48:27.839Z
Chains:       n/a
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0224

Title: Zebra has a Consensus Failure due to Improper Verification of V5 Transactions

Summary
- -------
Zebra has a Consensus Failure due to Improper Verification of V5 Transactions. --- 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.

Details
- -------
Summary
- --- 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.

Affected
- - zebrad (rust) < 4.3.0 — fixed in 4.3.0
- - zebra-consensus (rust) < 5.0.1 — fixed in 5.0.1

Severity
High (CVSS 8.4), as rated by the upstream advisory.

Recommended actions
- - Upgrade zebrad to 4.3.0 or later
- - Upgrade zebra-consensus to 5.0.1 or later

Source & attribution
This 0xCERT advisory summarises GHSA-3vmh-33xr-9cqh / CVE-2026-34377 from the GitHub Advisory Database, credited upstream to conradoplg, mpguerra, alchemydc: https://github.com/advisories/GHSA-3vmh-33xr-9cqh. Details may change; refer to the original source for the authoritative record.

References
- ----------
- - https://github.com/advisories/GHSA-3vmh-33xr-9cqh
- - CVE-2026-34377
- - 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
- - https://zips.z.cash/zip-0244
- - https://nvd.nist.gov/vuln/detail/CVE-2026-34377
- - https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0

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