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TI-2026-11425 Aliases CVE-2026-13500GHSA-m64j-m5c8-f58p

antlr ANTLR4 Grammar Action Block OutputFile.java code injection

Priority HIGH 70CWE-74Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
Low · Low · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00516 44th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
antlrANTLR44.13.0; 4.13.1; 4.13.2—No fix listedCNA
  • ANTLR4 Vendorantlr Affected 4.13.0; 4.13.1; 4.13.2 Fixed in — No fix listed CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:antlr:antlr4:*:*:*:*:*:*:*:*——antlr
  • cpe:2.3:a:antlr:antlr4:*:*:*:*:*:*:*:* Versions — — ·antlr

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-13500
  2. 2026-10-03 Alias added: GHSA-m64j-m5c8-f58p

References

Exploit 1

  • TI-2026-11428 antlr ANTLR4 tokenVocab Grammar Option TokenVocabParser.java getImportedVocabFile path traversal CVSS 4.0MEDIUM 6.9
  • TI-2026-11426 antlr ANTLR4 gofmt GoTarget.java GoTarget command injection CVSS 4.0MEDIUM 4.8
  • TI-2026-11427 antlr ANTLR4 Maven Plugin GrammarDependencies.java ObjectInputStream.readObject toctou CVSS 4.0LOW 2.0

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences