Input validation error in Zcash - #VU137466
Published: July 14, 2026
Vulnerability identifier: #VU137466
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to permanently store unwanted data on-chain at minimal cost.
The vulnerability exists due to improper input validation in Orchard proof data handling when processing transactions containing large padded Orchard proofs. A remote attacker can submit a specially crafted transaction to permanently store unwanted data on-chain at minimal cost.
The issue does not present a consensus violation or divergence risk.
Affected software
Zcash
Remediation
Install security update from vendor's website.
Zcash - update to 6.20.0