What is CVE-2026-13500?

CVE-2026-13500 is a high-severity vulnerability in Antlr Antlr4, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.3/10. Published 2026-06-28.

How severe is CVE-2026-13500?

High severity. CVSS v3 base score is 7.3 out of 10.

RCE in Antlr Antlr4

CVE-2026-13500

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 t…

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

Affected products

Antlr Antlr4 — versions 4.13.0, 4.13.1, 4.13.2

Weakness classification (CWE)

References

cna@vuldb.com (vdb-entry)
cna@vuldb.com (signature, permissions-required)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (issue-tracking, exploit)

Frequently asked questions

What is CVE-2026-13500?: CVE-2026-13500 is a high-severity vulnerability in Antlr Antlr4, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.3/10. Published 2026-06-28.
How severe is CVE-2026-13500?: High severity. CVSS v3 base score is 7.3 out of 10.