SB2026082570 - Deserialization of Untrusted Data in Apache Fory

Description

This security bulletin contains information about 1 vulnerability.

1) Deserialization of Untrusted Data (CVE-ID: CVE-2026-50076)

CWE-ID: CWE-502 - Deserialization of Untrusted Data

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to bypass deserialization security checks and invoke classpath-present deserialization hooks.

The vulnerability exists due to deserialization of untrusted data in the Java replace-resolve path in ReplaceResolverSerializer when processing crafted Fory serialized data. A remote attacker can send crafted serialized data to bypass class registration, TypeChecker, and DisallowedList checks to bypass deserialization security checks and invoke classpath-present deserialization hooks.

The issue affects the Java/JVM implementation.

Remediation

Install update from vendor's website.

References

• https://lists.apache.org/api/email.lua?id=oxmf0ggxh99hc572f92oq4yzpwhg4vzj
• https://fory.apache.org/security