Is CVE-2026-13503 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-13503?

CVE-2026-13503 has a CVSS v3 severity of MEDIUM (5.3).

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CVE-2026-13503

Description

A vulnerability was detected in antlr ANTLR4 up to 4.13.2. Affected by this issue is the function getImportedVocabFile of the file tool/src/org/antlr/v4/parse/TokenVocabParser.java of the component tokenVocab Grammar Option Handler. The manipulation results in path traversal. The attack can be executed remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.