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Vulnerability · Published Jun 28, 2026 · Assigned by VulDB

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

Medium 5.3

In plain English

A medium-severity path traversal in ANTLR4 from antlr. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.8%top 44.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12antlr4no fix listedDEBIAN-CVE-2026-13503
Debian:13antlr4no fix listedDEBIAN-CVE-2026-13503
Debian:14antlr4no fix listedDEBIAN-CVE-2026-13503
Ubuntu:22.04:LTSantlr4no fix listedUBUNTU-CVE-2026-13503
Ubuntu:24.04:LTSantlr4no fix listedUBUNTU-CVE-2026-13503
Ubuntu:25.10antlr4no fix listedUBUNTU-CVE-2026-13503
Ubuntu:26.04:LTSantlr4no fix listedUBUNTU-CVE-2026-13503
Ubuntu:26.10antlr4no fix listedUBUNTU-CVE-2026-13503

Affected products (as reported)

VendorProductVersions
antlr ANTLR4 4.13.04.13.14.13.2

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:R

References