antlr ANTLR4 up to 4.13.2 tokenVocab Grammar Option TokenVocabParser.java getImportedVocabFile path traversal

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k2.48

Summaryinfo

A vulnerability marked as critical has been reported in antlr ANTLR4 up to 4.13.2. This affects the function getImportedVocabFile of the file tool/src/org/antlr/v4/parse/TokenVocabParser.java of the component tokenVocab Grammar Option Handler. This manipulation causes path traversal. This vulnerability is tracked as CVE-2026-13503. The attack is possible to be carried out remotely. Moreover, an exploit is present. The vendor was contacted early about this disclosure but did not respond in any way.

Detailsinfo

A vulnerability was found in antlr ANTLR4 up to 4.13.2. It has been declared as critical. Affected by this vulnerability is the function getImportedVocabFile of the file tool/src/org/antlr/v4/parse/TokenVocabParser.java of the component tokenVocab Grammar Option Handler. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-13503. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known. MITRE ATT&CK project uses the attack technique T1006 for this issue.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Path traversal
CWE: CWE-22
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

06/27/2026 Advisory disclosed
06/27/2026 +0 days VulDB entry created
06/27/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Not defined

CVE: CVE-2026-13503 (🔒)
GCVE (CVE): GCVE-0-2026-13503
GCVE (VulDB): GCVE-100-374497
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/27/2026 20:33
Changes: 06/27/2026 20:33 (57)
Complete: 🔍
Submitter: jiazhou
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #838686: antlr ANTLR4 4.13.2 Path Traversal tokenVocab File Read (by jiazhou)

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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