Use-after-free in Zcash - #VU130977
Published: May 11, 2026
Vulnerability identifier: #VU130977
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service and potentially execute arbitrary code.
The vulnerability exists due to use-after-free in zcashd::ConnectBlock when processing a crafted block message that triggers an early return after script verification work has been queued. A remote attacker can send a specially crafted block to cause a denial of service and potentially execute arbitrary code.
The issue affects multi-threaded script verification configurations where worker threads may still dereference PrecomputedTransactionData after the backing vector has been destroyed.
Affected software
Zcash
Remediation
Install security update from vendor's website.
Zcash - update to 6.12.3