CVE-2026-13500 | antlr ANTLR4 up to 4.13.2 Grammar Action Block OutputFile.java code injection

A vulnerability categorized as critical has been discovered in antlr ANTLR4 up to 4.13.2. Affected is an unknown function of the file tool/src/org/antlr/v4/codegen/model/OutputFile.java of the component Grammar Action Block Handler. Executing a manipulation can lead to code injection.

The identification of this vulnerability is CVE-2026-13500. The attack may be launched remotely. Furthermore, there is an exploit available.

The vendor was contacted early about this disclosure but did not respond in any way.