# CVE-2026-64609: Apache Fory out-of-bounds read in zero-copy deserialization

Source: https://junglewise.ai/threats/cve-2026-64609-apache-fory-out-of-bounds-read-in-zero-copy-deserialization  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-21. Updated: 2026-07-21  
License: CC BY 4.0 with a link back

CVE-2026-64609 · Severity: info · CVSS 0 · Published 2026-07-21

Apache Fory (formerly Fury) is a high-performance serialization framework used to convert data objects into formats suitable for storage or transmission. A security flaw exists in its optional 'zero-copy' feature that could allow an attacker to trigger an out-of-bounds memory read. While this specific report is categorized as low impact, memory safety issues in serialization libraries can sometimes lead to data exposure or application instability.

Technologies: [Apache Software Foundation Fury](https://junglewise.ai/threats/technologies/fury). Vendors: [Apache Software Foundation](https://junglewise.ai/threats/vendors/apache-software-foundation).

## Quick answers

**Is CVE-2026-64609 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-64609 being exploited in the wild.

**How severe is CVE-2026-64609?** Informational severity, with a CVSS score of 0, published 21 July 2026.

**Which products and versions are affected?** Apache Software Foundation Fury 0.5.0 to 0.10.x; Apache Software Foundation Fury (fury-core) 0.5.0 to 0.10.x.

**Is there a fix for CVE-2026-64609?** A patch was published on 2026-07-21: Fixed in version 1.4.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-64609 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-64609?** Check whether you run Apache Software Foundation Fury or Apache Software Foundation Fury (fury-core) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An out-of-bounds read vulnerability (CWE-125) exists in Apache Fory (formerly Apache Fury) within the `readAlignedVarUint()` function. The issue is triggered during out-of-band zero-copy deserialization when using `sun.misc.Unsafe` to read data, allowing the process to read beyond the boundaries of the underlying buffer. This is an opt-in feature; applications not explicitly using zero-copy deserialization are unaffected. An attacker could potentially exploit this to access sensitive memory or cause a Denial of Service (DoS). The vulnerability is addressed in version 1.4.0.

## Affected products

- Apache Software Foundation Apache Fory 0.5.0 to 1.3.x
- Apache Software Foundation Apache Fury (fury-core) 0.5.0 to 0.10.x

## Timeline

- 2026-07-21: advisory
- 2026-07-21: patched: Fixed in version 1.4.0

## References

- [https://repo.maven.apache.org/maven2](https://repo.maven.apache.org/maven2)
- [https://lists.apache.org/thread/rdv22ks3b0cxh0r52w3ghxgkxqso3f1b](https://lists.apache.org/thread/rdv22ks3b0cxh0r52w3ghxgkxqso3f1b)

## Related threats

- [Apache Fory Use After Free in Rust deserialization logic](https://junglewise.ai/threats/cve-2026-60080-apache-fory-use-after-free-in-rust-deserialization-logic)
- [Apache Fury deserialization bypass in Java lambda deserialization](https://junglewise.ai/threats/cve-2026-64606-apache-fury-deserialization-bypass-in-java-lambda-deserialization)