CVE-2026-13501: Antlr ANTLR4

Medium severity, CVSS 5.3. EPSS: 1.2% chance of exploitation in the next 30 days.

A security vulnerability has been detected in antlr ANTLR4 up to 4.13.2. Affected by this vulnerability is the function GoTarget of the file tool/src/org/antlr/v4/codegen/target/GoTarget.java of the component gofmt. The manipulation leads to command injection. The attack can only be performed from a local environment. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products

• Antlr ANTLR4: version 4.13.0 only; version 4.13.1 only; version 4.13.2 only

Published 2026-06-28. Last modified 2026-06-29.