CVE-2026-13501Public exploit

Local command execution via gofmt path hijacking

Published Jun 28, 2026 · Updated Jun 28, 2026

Command injection in ANTLR 4 4.13.0 through 4.13.2 allows local users to execute commands during Go-target code generation. GoTarget.gofmt launches the bare gofmt program through ProcessBuilder and inherits the caller's executable search path, allowing an attacker-controlled path entry to select a substitute executable. Exploitation requires local control of the ANTLR process environment and a Go-target generation run; commands execute with that process's privileges.

CVSS severityUnavailable
Unscored
EPSS probability1.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in ANTLR 4 4.13.0 through 4.13.2 allows local users to execute commands during Go-target code generation. GoTarget.gofmt launches the bare gofmt program through ProcessBuilder and inherits the caller's executable search path, allowing an attacker-controlled path entry to select a substitute executable. Exploitation requires local control of the ANTLR process environment and a Go-target generation run; commands execute with that process's privileges.

The record

CVE
CVE-2026-13501
Published
Jun 28, 2026
Updated
Jun 28, 2026
Vendor
ANTLR
Product
ANTLR 4
Classifications
CWE-77, CWE-74, T1574.007
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

5.3VulDB CNACVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
4.8VulDB CNACVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
4.3VulDB CNAAV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
5.3VulDB CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-74Injection
T1574.007Path Interception by PATH Environment Variable

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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