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CVE-2026-13500— antlr ANTLR4 Grammar Action Block OutputFile.java code injection

Quick assessment

Affected
antlr ANTLR4
Exploitation
Public or AI PoC available; prioritize validation
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及之前版本存在安全漏洞，该漏洞源于Grammar Action Block Handler组件中OutputFile.java文件的未知函数功能问题，可能导致代码注入。

CVSS 7.3 · High EPSS 0.52% · P43

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-2026-13500

Vulnerability Information
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Vulnerability Title
antlr ANTLR4 Grammar Action Block OutputFile.java code injection
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in antlr ANTLR4 up to 4.13.2. Affected is an unknown function of the file tool/src/org/antlr/v4/codegen/model/OutputFile.java of the component Grammar Action Block Handler. Executing a manipulation can lead to code injection. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. 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:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
ANTLR 输入验证错误漏洞
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及之前版本存在安全漏洞，该漏洞源于Grammar Action Block Handler组件中OutputFile.java文件的未知函数功能问题，可能导致代码注入。
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-2026-13500

# POC Description Source Link Shenlong Link
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default-local-qwen3.6 · 12745 chars
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Full executable POC code
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III. Intelligence Information for CVE-2026-13500

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Proof of Concept for CVE-2026-13500 (1)

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

CVE-2026-13501 5.3 MEDIUM antlr ANTLR4 gofmt GoTarget.java GoTarget command injection
CVE-2026-13503 5.3 MEDIUM antlr ANTLR4 tokenVocab Grammar Option TokenVocabParser.java getImportedVocabFile path tra
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-94

V. Comments for CVE-2026-13500

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