CVE-2026-104435

High

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.

SeverityHigh

CVSS7.4

Exploit probability—

ProductZcashfoundation Zebra

PublishedOct 2, 2026

First seenOct 2, 2026

Weakness typeCWE-347CWE-347

How to fix

Update

ZcashFoundation zebra4.4.1, 6.0.1 or later

Vendor advisories

github.com/ZcashFoundation/zebra/security/advisories/GHSA-pvmv-cwg8-v6c8

Affected products

Product	Affected versions	Fixed in
ZcashFoundation zebra	4.4.0 ≤ v < 4.4.1, 6.0.0 ≤ v < 6.0.1	4.4.1, 6.0.1

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