CVE-2026-64606: fory Insecure Deserialization — Fix

Description

Deserialization of untrusted data vulnerability that may allow class-registration checks to be bypassed during Java lambda deserialization. Only lambda capture class is affected This issue affects Apache Fory: from before 1.4.0. Users are recommended to upgrade to version 1.4.0, which fixes the issue.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0063

Probability of exploitation

0.47%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-502 Deserialization of Untrusted Data

Affected Products

Vendor	Product	Versions
apache	fory	0.5.0 — 1.4.0

References

Advisories & Patches

https://lists.apache.org/thread/py6fbvm9nk1gxdd85rbzbozwzfh0jrsc

Other References

http://www.openwall.com/lists/oss-security/2026/07/21/4

Frequently Asked Questions

What is CVE-2026-64606? +

Deserialization of untrusted data vulnerability that may allow class-registration checks to be bypassed during Java lambda deserialization. Only lambda capture class is affected This issue affects Apache Fory: from before 1.4.0. Users are recommended to upgrade to version 1.4.0, which fixes the issue. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-64606? +

CVE-2026-64606 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0063, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-64606? +

CVE-2026-64606 affects products from apache, specifically: fory. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-64606? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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