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

Quick assessment

Affected
antlr ANTLR4
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ANTLR ANTLR是ANTLR团队的一款语法解析器生成框架。 ANTLR4 4.13.2及之前版本存在路径遍历漏洞，该漏洞源于tokenVocab Grammar Option Handler组件中文件tool/src/org/antlr/v4/parse/TokenVocabParser.java的函数getImportedVocabFile存在路径遍历，可能导致攻击者远程利用。

CVSS 5.3 · Medium EPSS 0.77% · P55

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
antlr ANTLR4 4.13.0 affected
4.13.1 affected
4.13.2 affected
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I. Basic Information for CVE-2026-13503

Vulnerability Information
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Vulnerability Title
antlr ANTLR4 tokenVocab Grammar Option TokenVocabParser.java getImportedVocabFile path traversal
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
ANTLR 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ANTLR ANTLR是ANTLR团队的一款语法解析器生成框架。 ANTLR4 4.13.2及之前版本存在路径遍历漏洞，该漏洞源于tokenVocab Grammar Option Handler组件中文件tool/src/org/antlr/v4/parse/TokenVocabParser.java的函数getImportedVocabFile存在路径遍历，可能导致攻击者远程利用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
antlr ANTLR4 4.13.0 cpe:2.3:a:antlr:antlr4:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-13503

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III. Intelligence Information for CVE-2026-13503

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Other References for CVE-2026-13503 (1)

Same Patch Batch · antlr · 2026-06-28 · 4 CVEs total

CVE-2026-13500 7.3 HIGH antlr ANTLR4 Grammar Action Block OutputFile.java code injection
CVE-2026-13501 5.3 MEDIUM antlr ANTLR4 gofmt GoTarget.java GoTarget command injection
CVE-2026-13502 4.5 MEDIUM antlr ANTLR4 Maven Plugin GrammarDependencies.java ObjectInputStream.readObject toctou

IV. Related Vulnerabilities

Same product: ANTLR4
Same vendor: antlr
Same weakness: CWE-22

V. Comments for CVE-2026-13503

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