CVE-2026-34377 json
Zebra has a Consensus Failure due to Improper Verification of V5 Transactions
published 2026-03-30 7 mo ago modified 2026-07-24 3 mo ago also GHSA-3vmh-33xr-9cqh , EUVD-2026-17467
- cvss
- 8.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 17%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- crates.io zebrad 4.3.0
- crates.io zebra-consensus 5.0.1
- zfnd zebra 4.3.0
- zfnd zebra-consensus 5.0.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.4 | 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 | 4.0 | 8.4 | 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/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 |
| NVD | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | zebrad | <4.3.0 |
4.3.0 |
| crates.io | zebra-consensus | <5.0.1 |
5.0.1 |
Affected products
- ZcashFoundation zebra
- ZcashFoundation zebra-consensus
Classification
- Weakness
-
- CWE-347 Improper Verification of Cryptographic Signature
References
-
github.com
/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh
web, exploit, vendor-advisory
-
zfnd.org
/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements
web, vendor-advisory
-
github.com
/ZcashFoundation/zebra/releases/tag/v4.3.0
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-34377
advisory
-
github.com
/ZcashFoundation/zebra
package
-
zips.z.cash
/zip-0244
web
Sources
- CVE List CVE-2026-34377
- GitHub Advisory GHSA-3vmh-33xr-9cqh
- NVD CVE-2026-34377
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