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Vulnerability · Published Jun 28, 2026 · Assigned by VulDB

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

Medium 4.5

In plain English

A medium-severity race condition in ANTLR4 from antlr. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).

Severity (CVSS 3.1)4.5Medium
Exploit odds (30 days)0.1%top 98.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12antlr4no fix listedDEBIAN-CVE-2026-13502
Debian:13antlr4no fix listedDEBIAN-CVE-2026-13502
Debian:14antlr4no fix listedDEBIAN-CVE-2026-13502
Ubuntu:22.04:LTSantlr4no fix listedUBUNTU-CVE-2026-13502
Ubuntu:24.04:LTSantlr4no fix listedUBUNTU-CVE-2026-13502
Ubuntu:25.10antlr4no fix listedUBUNTU-CVE-2026-13502
Ubuntu:26.04:LTSantlr4no fix listedUBUNTU-CVE-2026-13502
Ubuntu:26.10antlr4no fix listedUBUNTU-CVE-2026-13502

Affected products (as reported)

VendorProductVersions
antlr ANTLR4 4.13.04.13.14.13.2

Weakness: CWE-367, CWE-362 · Vector: 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

References