CVE-2026-64608 Apache Fory: Heap type confusion and out-of-bounds read/write in C++ compatible-mode field-skip paths
Attackers can trigger heap type confusion and out-of-bounds memory access in Apache Fory C++ by sending crafted serialized data in compatible mode.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-64608?
CVE-2026-64608 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
Heap type confusion and out-of-bounds read/write in the Apache Fory C++ implementation. When deserializing data in compatible mode, the field-skip paths do not correctly validate the declared field types against the actual data, so input with an inconsistent schema can cause type confusion and out-of-bounds memory access. Only the C++ implementation is affected; other language implementations of Apache Fory are not.
This issue affects Apache Fory C++: from 0.14.0 before 1.4.0.
Users are recommended to upgrade to version 1.4.0, which fixes the issue.
Which versions are affected by CVE-2026-64608?
It affects 1 product.
Products include Apache Fory.
How do I fix CVE-2026-64608?
No fix has been published for CVE-2026-64608 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-2026-64608 being exploited?
There is no known exploitation of CVE-2026-64608 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
- CVE-2026-64606 Apache Fory, Apache Fory: Class-registration bypass through an auto-admitted SerializedLambda capturing interface
- CVE-2026-48207 Apache Fory: PyFory ReduceSerializer Incomplete Policy Enforcement
- CVE-2025-61622 Apache Fory, Apache Fory: Python RCE via unguarded pickle fallback serializer in pyfory
- CVE-2026-71560 Apache Fory: Out-of-bounds heap read in C++ struct deserializer tagged-int fast-path
Sources
Also known as GHSA-wh2x-66qr-23v8.