CVE-2026-64609: Apache Fory

Critical severity, CVSS 9.1. EPSS: 0.8% chance of exploitation in the next 30 days.

Out-of-bounds read via sun.misc.Unsafe in Apache Fory. When out-of-band zero-copy deserialization is used, readAlignedVarUint() can read beyond the bounds of the underlying buffer. Out-of-band zero-copy deserialization is an opt-in feature; applications that do not use it are not affected. This issue affects Apache Fory (formerly Apache Fury): from 0.5.0 before 1.4.0. Versions before 0.11.0 were published under the Maven coordinates org.apache.fury:fury-core. Users are recommended to upgrade to version 1.4.0, which fixes the issue.

Affected products

• Apache Fory: from 0.5.0, before 1.4.0 (fixed in 1.4.0)

Published 2026-07-21. Last modified 2026-07-27.