Vulnerability in Zcashfoundation Zebra
CVE-2026-104435
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.
Published .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-pvmv-cwg8-v6c8) (vendor-advisory)
- VulnCheck Advisory: Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Without Output (third-party-advisory)
Frequently asked questions
- What is CVE-2026-104435?
- CVE-2026-104435 is a high-severity vulnerability in Zcashfoundation Zebra, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.4/10. Published 2026-10-02.
- How severe is CVE-2026-104435?
- High severity. CVSS v3 base score is 7.4 out of 10.