How severe is CVE-2026-64606?

CVE-2026-64606 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-64606 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-64606?

CVE-2026-64606 affects Apache Fory. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-64606?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2026-64606 published?

CVE-2026-64606 was published on 2026-07-21 and last updated on 2026-07-27.

CVE-2026-64606

CVE-2026-64606 is a critical-severity vulnerability in Apache Fory with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Apache Fory
Published: 2026-07-21
Last modified: 2026-07-27

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.

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.
How severe is CVE-2026-64606?: CVE-2026-64606 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-64606 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-64606?: CVE-2026-64606 affects Apache Fory. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-64606?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2026-64606 published?: CVE-2026-64606 was published on 2026-07-21 and last updated on 2026-07-27.

References

Affected products (1)

cpe:2.3:a:apache:fory:*:*:*:*:*:*:*:*

More vulnerabilities in Apache Fory

CVE-2026-71558 — Critical (CVSS 9.8): Heap type confusion vulnerability in Apache Fory C++ deserialization. This issue affects Apache Fory C++ versions from…
CVE-2026-64608 — Critical (CVSS 9.8): Heap type confusion and out-of-bounds read/write in the Apache Fory C++ implementation. When deserializing data in…
CVE-2026-48207 — Critical (CVSS 9.8): Deserialization of untrusted data in Apache Fory PyFory. PyFory's ReduceSerializer could bypass documented…
CVE-2025-61622 — Critical (CVSS 9.8): Deserialization of untrusted data in python in pyfory versions 0.12.0 through 0.12.2, or the legacy pyfury versions…
CVE-2026-71560 — Critical (CVSS 9.1): Out-of-bounds Read vulnerability in Apache Fory C++ deserialization. This issue affects Apache Fory C++ versions from…
CVE-2026-64609 — Critical (CVSS 9.1): Out-of-bounds read via sun.misc.Unsafe in Apache Fory. When out-of-band zero-copy deserialization is used,…

All CVEs affecting Apache Fory →

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities

CVE-2026-69836 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Entra ID allows an unauthorized attacker to execute code over a network.
CVE-2026-17061 — Critical (CVSS 10.0): A Deserialization of Untrusted Data vulnerability affecting SIMULIA Execution Engine from Release 2023 through Release…
CVE-2026-11756 — Critical (CVSS 10.0): A Deserialization of Untrusted Data vulnerability affecting Station Launcher App in 3DEXPERIENCE platform from Release…
CVE-2026-41104 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Planetary Computer Pro allows an unauthorized attacker to disclose…
CVE-2026-43633 — Critical (CVSS 10.0): HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a…
CVE-2026-33819 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.

Browse all CWE-502 (Deserialization of Untrusted Data) vulnerabilities →