CVE-2026-13500

HIGH 7.3

antlr ANTLR4 Grammar Action Block OutputFile.java code injection

CVSS Score

7.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-94 CWE-74
Vendor	antlr
Product	antlr4
Published	Jun 28, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

antlr / ANTLR4

4.13.0 4.13.1 4.13.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/374495 vuldb.com: https://vuldb.com/vuln/374495/cti vuldb.com: https://vuldb.com/cve/CVE-2026-13500 vuldb.com: https://vuldb.com/submit/838568 github.com: https://github.com/wooyun123/wooyun/issues/4

Credits

🔍 jiazhou (VulDB User) VulDB CNA Team