CVE-2026-71558 Apache Fory: Heap type confusion in C++ polymorphic smart-pointer deserialization
A heap type confusion in Apache Fory C++ allows attackers to execute arbitrary code or cause denial of service via crafted deserialization payloads.
- 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-2026-71558?
CVE-2026-71558 is a critical unsafe deserialization vulnerability in Apache Fory, published on 7 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Heap type confusion vulnerability in Apache Fory C++ deserialization.
This issue affects Apache Fory C++ versions from 0.14.0 before 1.5.0. A crafted input payload can bypass type compatibility checks during polymorphic smart-pointer deserialization, causing an object of an incompatible type to be treated as the declared base type. This may result in undefined behavior and potentially lead to denial of service or arbitrary code execution.
Users are recommended to upgrade to Apache Fory 1.5.0, which fixes this issue. Applications not using Apache Fory C++ polymorphic smart-pointer deserialization are not affected.
Which versions are affected by CVE-2026-71558?
It affects 1 product.
Products include Apache Fory.
How do I fix CVE-2026-71558?
No fix has been published for CVE-2026-71558 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-2026-71558 being exploited?
There is no known exploitation of CVE-2026-71558 in the wild and no public exploit code.
Other vulnerabilities in Apache Fory
- CVE-2026-64606 Apache Fory, Apache Fory: Class-registration bypass through an auto-admitted SerializedLambda capturing interface
- CVE-2026-64608 Apache Fory: Heap type confusion and out-of-bounds read/write in C++ compatible-mode field-skip paths
- 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-rwv5-p9fv-c8fp.