What is CVE-2026-64608?

CVE-2026-64608 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-2026-64608?

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

Buffer overflow in Apache Fory

CVE-2026-64608

Heap type confusion and out-of-bounds read/write in the Apache Fory C++ implementation. When deserializing data in compatible mode, the field-skip paths do not correctly validate the declared field types against the actual data, so input with an inconsistent schema can cause type confusion and out-of-bounds memory access. Only the C++ implementation is affected; other language implementations of Apache Fory are not. This issue affects Apache Fory C++: from 0.14.0 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 2026-08-11.

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 (56.3th percentile), scored 2026-10-22.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Apache Fory
Apache Software Foundation Fory — versions 0.14.0

Weakness classification (CWE)

References

lists.apache.org/thread/wl05slf57zzoq1s4pg4tk6nx6mjyjr4b (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-64608?: CVE-2026-64608 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-2026-64608?: Critical severity. CVSS v3 base score is 9.8 out of 10.