CVE-2026-13502

MEDIUM 4.5

antlr ANTLR4 Maven Plugin GrammarDependencies.java ObjectInputStream.readObject toctou

CVSS Score

4.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-367 CWE-362
Vendor	antlr
Product	antlr4
Published	Jun 28, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

antlr / ANTLR4

4.13.0 4.13.1 4.13.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 jiazhou (VulDB User) VulDB CNA Team