CVE-2026-104435

HIGH 7.4

Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Without Output

CVSS Score

7.4

EPSS Score

0.0%

EPSS Percentile

0th

Zebra zebrad 4.4.0 and zebra-script 6.0.0 fail to enforce a ZIP-244 consensus rule, accepting V5 transparent inputs signed with SIGHASH_SINGLE that lack a corresponding output. Attackers can broadcast crafted V5 transactions with more inputs than outputs that Zebra accepts but zcashd rejects, causing a network consensus split.

CWE	CWE-347
Vendor	zcashfoundation
Product	zebra
Published	Oct 2, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

High

Affected Versions

ZcashFoundation / zebra

4.4.0 < 4.4.1

ZcashFoundation / zebra

6.0.0 < 6.0.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-pvmv-cwg8-v6c8 vulncheck.com: https://www.vulncheck.com/advisories/zebra-4.4.0-consensus-divergence-via-v5-sighash-single-without-output

Credits

🔍 sangsoo-osec 🔍 fivelittleducks