Vulnerability in Antlr Antlr4

CVE-2026-13502

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 man…

Vulnerability class: Race Condition

CVSS v3 metric

CVSS v3 base score 4.5 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-13502?
CVE-2026-13502 is a medium-severity vulnerability in Antlr Antlr4, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 4.5/10. Published 2026-06-28.
How severe is CVE-2026-13502?
Medium severity. CVSS v3 base score is 4.5 out of 10.