Vulnerability · Published Oct 2, 2026 · Assigned by VulnCheck
CVE-2026-104435Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Without Output
High 7.4
In plain English
A high-severity security flaw in zebra from ZcashFoundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).
Severity (CVSS 3.1)7.4High
Exploit odds (30 days)0.2%top 89.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ZcashFoundation | zebra | 4.4.0 – before 4.4.1 |
| ZcashFoundation | zebra | 6.0.0 – before 6.0.1 |
Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
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