| Title | antlr ANTLR4 4.13.2 Unsafe Java Deserialization Maven Plugin |
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| Description | The ANTLR4 Maven plugin (`antlr4-maven-plugin`) uses `ObjectInputStream.readObject()` without setting an `ObjectInputFilter` to deserialize a grammar dependency status file from the build directory. An attacker with write access to the build directory (via shared CI cache poisoning, compromised dependencies that have filesystem access, or a TOCTOU race condition) can replace the status file with a serialized gadget chain and achieve Remote Code Execution on the build server. Confirmed: the deserializer accepts arbitrary class names, attempting to load attacker-controlled classes. |
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| Source | ⚠️ https://github.com/wooyun123/wooyun/issues/7 |
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| User | jiazhou (UID 89028) |
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| Submission | 05/27/2026 12:11 (1 month ago) |
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| Moderation | 06/27/2026 20:28 (1 month later) |
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| Status | Accepted |
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| VulDB entry | 374498 [antlr ANTLR4 up to 4.13.2 Maven Plugin GrammarDependencies.java ObjectInputStream.readObject toctou] |
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| Points | 20 |
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