Critical9.1Apache Software Foundation

Critical [CVE-2026-64609] Out-of-bounds read via sun.misc.Unsafe in Apache Fory

This critical-severity Apache Software Foundation advisory covers CVE-2026-64609 affecting Apache Fory, Apache Fury.

CVE-2026-64609 Published Jul 21, 2026Updated by vendor Jul 27, 2026

CVE-2026-64609

Affected products & platforms

Apache Software FoundationUnclassified

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Summary

Out-of-bounds read via sun.misc. Unsafe in Apache Fory.

When out-of-band zero-copy deserialization is used, readAlignedVarUint() can read beyond the bounds of the underlying buffer. Out-of-band zero-copy deserialization is an opt-in feature; applications that do not use it are not affected.

This issue affects Apache Fory (formerly Apache Fury): from 0.5.0 before 1.4.0. Versions before 0.11.0 were published under the Maven coordinates org.apache.fury:fury-core.

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

Affected versions

0.5.0 through 1.4.0.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

1.4.0
0.11.0

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

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

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed for the summary, affected/fixed versions and remediation guidance it provides.
Apache Software Foundation
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-64609 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-64609NVD CVE.org MITRE

Official resources

ASF Security — reporting & CVE process
Official documentation
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Apache project downloads (fixed releases)
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