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ANTLR4 Maven Plugin CVE-2026-13502

| EUVDEUVD-2026-40000 LOW
Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367)
2026-06-28 VulDB GHSA-h73j-vjhq-j9vg
Java Information Disclosure Antlr4
1.1
CVSS 4.0 · Vendor: VulDB

Severity by source

Vendor (VulDB) PRIMARY
1.1 LOW
CVSS: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
vuln.today AI
4.5 MEDIUM

Local-only race condition requiring low privileges and high complexity; limited impact across all three dimensions with no scope change.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
4.0 AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

CVSS: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
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jun 28, 2026 - 15:31 vuln.today
CVSS changed
Jun 28, 2026 - 15:22 NVD
2.0 (LOW) 1.1 (LOW)

DescriptionCVE.org

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.

AnalysisAI

Time-of-check time-of-use (TOCTOU) race condition in antlr4-maven-plugin up to version 4.13.2 allows a local low-privileged attacker to manipulate grammar dependency state between validation and consumption in ObjectInputStream.readObject() within GrammarDependencies.java, yielding limited confidentiality, integrity, and availability impact on build artifacts. No public exploit identified at time of analysis is incorrect here - a publicly available exploit exists via a GitHub issue, though KEV listing is absent, indicating no confirmed widespread active exploitation. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain local low-privilege account on build server
Delivery
Monitor or trigger Maven build invoking antlr4-maven-plugin
Exploit
Identify TOCTOU race window in GrammarDependencies.java ObjectInputStream.readObject()
Execution
Replace grammar dependency file between check and use operations
Impact
Achieve limited read/write/availability impact on build artifacts
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Vulnerability AssessmentAI

Exploitation Exploitation requires a local operating system session on the machine executing the Maven build, with at least low-level OS privileges (PR:L per CVSS 4.0 vector). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 1.1 (vector AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N with exploit maturity E:P) accurately represents a low-priority vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A local attacker with a low-privileged shell account on a shared CI/CD build server initiates or monitors a Maven build that invokes antlr4-maven-plugin. During the brief interval between GrammarDependencies.java checking the grammar dependency file and consuming it via ObjectInputStream.readObject(), the attacker replaces the file on disk with a crafted substitute. …
Remediation No vendor-released patch has been identified at time of analysis - the vendor did not respond to coordinated disclosure. … Detailed patch versions, workarounds, and compensating controls in full report.
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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-13502 vulnerability details – vuln.today
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