What’s Vulnerable › Vulnerabilities

CVE-2026-13502: antlr ANTLR4 Maven Plugin GrammarDependencies.java ObjectInputStream.readObject toctou

• Severity: medium (CVSS 4.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-28 · updated 2026-10-25
• Weakness: CWE-362

Description

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.

Affected products

• ANTLR4: 4.13.0, 4.13.1, 4.13.2

References

• https://github.com/wooyun123/wooyun/issues/7
• https://vuldb.com/cve/CVE-2026-13502
• https://vuldb.com/submit/838685
• https://vuldb.com/vuln/374498
• https://vuldb.com/vuln/374498/cti

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