CVE-2026-64606 Apache Fory, Apache Fory: Class-registration bypass through an auto-admitted SerializedLambda capturing interface

What is CVE-2026-64606?

CVE-2026-64606 is a critical unsafe deserialization vulnerability in Apache Fory, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Deserialization of untrusted data vulnerability that may allow class-registration checks to be bypassed during Java lambda deserialization. Only lambda capture class is affected

This issue affects Apache Fory: from before 1.4.0.

Users are recommended to upgrade to version 1.4.0, which fixes the issue.

Weakness: CWE-502

Which versions are affected by CVE-2026-64606?

It affects 1 product.

Products include Apache Fory.

How do I fix CVE-2026-64606?

No fix has been published for CVE-2026-64606 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2026-64606 being exploited?

There is no known exploitation of CVE-2026-64606 in the wild and no public exploit code.

Other vulnerabilities in Apache Fory

• CVE-2026-71558 Apache Fory: Heap type confusion in C++ polymorphic smart-pointer deserialization Critical 9.8
• CVE-2026-64608 Apache Fory: Heap type confusion and out-of-bounds read/write in C++ compatible-mode field-skip paths Critical 9.8
• CVE-2026-48207 Apache Fory: PyFory ReduceSerializer Incomplete Policy Enforcement Critical 9.8
• CVE-2025-61622 Apache Fory, Apache Fory: Python RCE via unguarded pickle fallback serializer in pyfory Critical 9.8
• CVE-2026-71560 Apache Fory: Out-of-bounds heap read in C++ struct deserializer tagged-int fast-path Critical 9.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-qwm7-r3rv-3hw8.