Vulnerability in Zcashfoundation Zebra
CVE-2026-104437
Zebra before 4.4.0 contains a consensus divergence vulnerability in V5 transparent signature verification, computing a ZIP-244 digest for SIGHASH_SINGLE inputs lacking corresponding outputs instead of failing. Attackers can craft V5 transactions with fewer outputs than inputs that Zebra accepts and templates via getblocktemplate, producing blocks zcashd rejects.
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.com/ZcashFoundation/zebra/security/advisories/GHSA-cwfq-rfcr-8hmp (vendor-advisory)
- www.vulncheck.com/advisories/zebra-before-4.4.0-consensus-split-via-sighash-sin… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-104437?
- CVE-2026-104437 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-2026-104437?
- High severity. CVSS v3 base score is 7.4 out of 10.