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CVE-2026-64609

Apache Fory out-of-bounds read

9.1 CRITICALEPSS 0.78%
  1. Published21 Jul 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

Apache Fory≥ 0.5.0 < 1.4.0

Remediation

Fixed in
Apache Fory≥ 1.4.0

References

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Frequently asked

Is CVE-2026-64609 being actively exploited?

CVE-2026-64609 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.78%.

How severe is CVE-2026-64609?

CVE-2026-64609 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.78% probability of exploitation.

Which products are affected by CVE-2026-64609?

Affected products include Apache Fory.

How do I fix CVE-2026-64609?

Upgrade affected software to a fixed version, for example Apache Fory 1.4.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-64609 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.