CVE-2026-13502Public exploit

Local unspecified impact via readObject race

Published Jun 28, 2026 · Updated Jun 28, 2026

TOCTOU race in the ANTLR 4 Maven Plugin 4.13.0 through 4.13.2 allows local users to cause unspecified impact during deserialization. GrammarDependencies.java invokes ObjectInputStream.readObject across a check-use gap, allowing a local race to replace the serialized input. Exploitation requires low-privileged local access and precise timing; public sources do not identify the specific data exposed, altered, or interrupted.

CVSS severity4.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TOCTOU race in the ANTLR 4 Maven Plugin 4.13.0 through 4.13.2 allows local users to cause unspecified impact during deserialization. GrammarDependencies.java invokes ObjectInputStream.readObject across a check-use gap, allowing a local race to replace the serialized input. Exploitation requires low-privileged local access and precise timing; public sources do not identify the specific data exposed, altered, or interrupted.

The record

CVE
CVE-2026-13502
Published
Jun 28, 2026
Updated
Jun 28, 2026
Vendor
ANTLR
Product
ANTLR 4
Classifications
CWE-362, CWE-367
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.13.0
  2. Affected versionversion=4.13.1
  3. Affected versionversion=4.13.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

ANTLR · ANTLR 4version=4.13.0; version=4.13.1; version=4.13.2

Published CVSS scores

3.5VulDBAV:L/AC:H/Au:S/C:P/I:P/A:P
1.1VulDBCVSS: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
4.5VulDBCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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