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Technical
A critical security flaw has been identified in the Java component of the Apache Fory multi‑language serialization framework, tracked as CVE‑2026‑50076. The vulnerability resides within the deserialization path of the `ReplaceResolverSerializer` in the `fory-core` Java SDK, affecting all versions prior to 1.1.0.
Apache Fory is designed to provide high‑performance, cross‑language serialization while offering security controls such as class registration, a type checker, and a disallowed list. However, when processing objects that implement the `writeReplace` / `readResolve` or `Externalizable` patterns, Fory invokes the `ReplaceResolverSerializer` without subjecting the incoming data to these standard security checks. This oversight creates a bypass scenario where a remote attacker can craft malicious Fory‑formatted data that directly triggers `readResolve` or `readExternal` hooks present on classes within the target application’s classpath.
By carefully constructing the serialized payload, an attacker can cause the application to execute arbitrary methods on unexpected gadgets—such as java.lang.Runtime—potentially leading to remote code execution (RCE). The vulnerability is considered Important due to its low attack complexity, no required privileges, and the fact that it can be exploited over a network without user interaction. The issue has been addressed in Apache Fory version 1.1.0, which enforces the same validation checks on the `ReplaceResolverSerializer` code path.
DailyCVE Form:
Platform: Java / JVM
Version: < 1.1.0
Vulnerability: Deserialization bypass
Severity: Important (CVSS 9.1)
Date: 2026‑06‑04
Prediction: 2026‑06‑18
What Undercode Say:
Identify affected Apache Fory versions (Java SDK) Check Maven dependency tree mvn dependency:tree | grep "org.apache.fory:fory-core" Or inspect Gradle dependencies ./gradlew dependencies | grep "org.apache.fory:fory-core" Verify the version in a compiled JAR jar tf fory-core-.jar | grep -i "version|pom.properties"
// Example of a vulnerable configuration (pseudo-code) Fury fury = Fury.builder() .withLanguage(Language.JAVA) .build(); // No class registration, no type checking – vulnerable to exploitation byte[] malicious = ...; // Attacker-controlled input Object obj = fury.deserialize(malicious); // Triggers readResolve/readExternal
How Exploit:
To exploit CVE‑2026‑50076, an attacker sends a crafted serialized Fory payload to a service that deserializes untrusted Java data. The attacker first identifies a class within the target’s classpath that contains a `readResolve` or `readExternal` method—for example, a known gadget like `javax.naming.ldap.Rdn` or org.apache.commons.dbcp.datasources.SharedPoolDataSource. The payload is then structured such that the `ReplaceResolverSerializer` is triggered, bypassing the class registration, type checker, and disallowed list. Upon deserialization, the hook method executes, leading to arbitrary code execution.
Protection from this CVE:
- Upgrade to Apache Fory version 1.1.0 or later, which applies the same validation checks to the `ReplaceResolverSerializer` path.
- Enable strict deserialization policies in your application if using an older version, though this is not a complete mitigation.
- Network isolation – restrict access to services that deserialize Fory data to trusted clients only.
- Monitor logs for unexpected deserialization attempts (e.g., large payloads containing gadget classes).
Impact:
- Remote Code Execution (RCE) – an unauthenticated attacker can execute arbitrary code on the affected Java/JVM system.
- Data confidentiality and integrity compromise – the attacker may read, modify, or delete sensitive data.
- Full system compromise – if the exploited code runs with elevated privileges, the attacker can take control of the host system.
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Sources:
Reported By: nvd.nist.gov
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