CVE-2026-11526

Command execution and file overwrite via two-argument open

Published Jun 14, 2026 · Updated Jun 14, 2026

OS command injection in Reini Urban GD before 2.86 allows attackers to execute commands or overwrite files through crafted pathname arguments. GD::Image::_make_filehandle passes filenames to Perl's two-argument open(), which treats pipe and redirect syntax as commands or file operations. Exploitation requires a caller to supply untrusted input to a filename-accepting constructor; commands run and files are truncated under the process UID.

CVSS severity9.8
Critical
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Reini Urban GD before 2.86 allows attackers to execute commands or overwrite files through crafted pathname arguments. GD::Image::_make_filehandle passes filenames to Perl's two-argument open(), which treats pipe and redirect syntax as commands or file operations. Exploitation requires a caller to supply untrusted input to a filename-accepting constructor; commands run and files are truncated under the process UID.

The record

CVE
CVE-2026-11526
Published
Jun 14, 2026
Updated
Jun 14, 2026
Vendor
Reini Urban
Product
GD
Classifications
CWE-73, CWE-78, T1059
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 14, 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=0 <2.86

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Reini Urban · GDversion=0 <2.86

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-73External Control of File Name or Path
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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