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TI-2026-11427 Aliases CVE-2026-13502GHSA-h73j-vjhq-j9vg

antlr ANTLR4 Maven Plugin GrammarDependencies.java ObjectInputStream.readObject toctou

Priority MEDIUM 44CWE-362Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

A flaw has been found in antlr ANTLR4 up to 4.13.2. This affects the function ObjectInputStream.readObject of the file antlr4-maven-plugin/src/main/java/org/antlr/mojo/antlr4/GrammarDependencies.java of the component Maven Plugin. This manipulation causes time-of-check time-of-use. The attack is restricted to local execution. A high degree of complexity is needed for the attack. It is indicated that the exploitability is difficult. The exploit has been published and may be used. 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 0.00111 1st 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
No
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.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-13502
  2. 2026-10-03 Alias added: GHSA-h73j-vjhq-j9vg

References

Exploit 1

  • TI-2026-11428 antlr ANTLR4 tokenVocab Grammar Option TokenVocabParser.java getImportedVocabFile path traversal CVSS 4.0MEDIUM 6.9
  • TI-2026-11425 antlr ANTLR4 Grammar Action Block OutputFile.java code injection CVSS 4.0MEDIUM 6.9
  • TI-2026-11426 antlr ANTLR4 gofmt GoTarget.java GoTarget command injection CVSS 4.0MEDIUM 4.8

Sources

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