CVE-2026-13503: antlr ANTLR4 tokenVocab Grammar Option TokenVocabParser.java getImportedVocabFile path traversal

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-28 · updated 2026-10-25
Weakness: CWE-22

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.

Affected products

ANTLR4: 4.13.0, 4.13.1, 4.13.2

References

https://github.com/wooyun123/wooyun/issues/8
https://vuldb.com/cve/CVE-2026-13503
https://vuldb.com/submit/838686
https://vuldb.com/vuln/374497
https://vuldb.com/vuln/374497/cti

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