CVE-2026-13502

antlr ANTLR4 Maven Plugin GrammarDependencies.java ObjectInputStream.readObject toctou

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

antlr · ANTLR4

CVSS v4.0 VULDB

1.1 LOWCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 VULDB

4.5 MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS v2.0 VULDB

3.5 LOWAV:L/AC:H/Au:S/C:P/I:P/A:P

EPSS

0.11% chance of exploitation in the next 30 days, 1st percentile

Published

2026-06-28

Updated

2026-06-29

Proof-of-concept exploits (1)

• wooyun123/wooyun/issues/70★ · 2025-09-04

References

• CVE Record
• NVD entry

Related

• CVE-2025-10765
• CVE-2026-13500
• CVE-2026-13501
• CVE-2026-13503