What is CVE-2026-64606?

CVE-2026-64606 is a critical-severity vulnerability in Apache Fory, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-07-21.

How severe is CVE-2026-64606?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in Apache Fory

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.

Vulnerability class: Insecure Deserialization

Published 2026-07-21 · last modified 2026-07-27.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (55.1th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.001

Affected products

Apache Fory
Apache Software Foundation Fory — versions 0.11.0, 0.5.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

lists.apache.org/thread/py6fbvm9nk1gxdd85rbzbozwzfh0jrsc (vendor-advisory, Issue Tracking, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory)

Frequently asked questions

What is CVE-2026-64606?: CVE-2026-64606 is a critical-severity vulnerability in Apache Fory, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-07-21.
How severe is CVE-2026-64606?: Critical severity. CVSS v3 base score is 9.8 out of 10.