Input validation error in Zcash - #VU130979
Published: May 11, 2026
Vulnerability identifier: #VU130979
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Zcash
Zcash
Software vendor:
Electric Coin Co.
Electric Coin Co.
Description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper input validation in the V4 Sapling transaction parser when processing malformed raw block data containing a non-zero valueBalanceSapling with no Sapling spends or outputs. A remote user can embed a specially crafted malformed transaction directly into raw block bytes to cause a denial of service.
Exploitation requires a miner or custom raw block producer to place the malformed raw transaction bytes directly into a block, because ordinary zcashd relay and mining canonicalize the encoding before block production.
Remediation
Install security update from vendor's website.