High 7.3Published Jun 28, 2026

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

Updated under an hour ago (Oct 28, 2026, 6:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for ANTLR4

Exploited in the last 30 days

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.

CVSS: 7.3 HIGH (v3.1, CNA)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
Weakness (CWE): CWE-94, CWE-74
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulDB
NVD analysis: Deferred
Record last updated: Jun 29, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

antlr ANTLR4 antlr:antlr4	4.13.0; 4.13.1; 4.13.2	CNA record

References

References

https://vuldb.com/vuln/374495	vdb-entry
https://vuldb.com/vuln/374495/cti	signature, permissions-required
https://vuldb.com/cve/CVE-2026-13500	third-party-advisory
https://vuldb.com/submit/838568	third-party-advisory
https://github.com/wooyun123/wooyun/issues/4	exploit, issue-tracking

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.