CVE-2026-64608: Apache Fory: Heap type confusion and out-of-bounds read/write in C++ compatible-mode field-skip paths

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-21 · updated 2026-10-24
Weakness: CWE-502

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.

Affected products

Apache Software Foundation Apache Fory: from 0.14.0 before 1.4.0 — fixed in 1.4.0

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Fory 1.4.0. Check the vendor advisory for mitigations.

References

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