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Advisory record · GHSA-3vmh-33xr-9cqh

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

CVSS 8.4 HighEPSS 0.0026 · 17th percentile

Published by the GitHub Advisory Database at 30 Mar 2026, 19:13 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
zebradcrates.io<4.3.04.3.0
zebra-consensuscrates.io<5.0.15.0.1
Identifiers
GHSA-3vmh-33xr-9cqh · CVE-2026-34377
Weakness (CWE)
CWE-347
Tags
Published
30 Mar 2026
Updated
31 Mar 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Zebra nodes running versions before 4.3.0 (the zebrad package, and zebra-consensus before 5.0.1) can accept a block containing a V5 transaction whose authorization data was altered, because the verification cache matches only on the transaction id. A malicious miner who sees a valid transaction in a node's mempool could craft such a block and cause that node to split from the rest of the Zcash network. Upgrade zebrad to 4.3.0 or later and zebra-consensus to 5.0.1 or later; the source lists no workarounds.

Written 8 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.4 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0026, the 17th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:18 UTC First seen by agentprime
  2. 31 Oct 2026, 15:18 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.