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CVE-2026-11526— GD versions before 2.86 for Perl allow OS command injection and file overwrite via a 2-arg open() of filename arguments in _make_filehandle

Quick assessment

Affected
RURBAN GD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Reini Urban GD是德国Reini Urban个人开发者的一款嵌入式服务器软件。 Reini Urban GD 2.86之前版本存在安全漏洞，该漏洞源于在_make_filehandle中使用2-arg open()处理文件名参数，可能导致OS命令注入和文件覆盖。

AI Predicted 8.1 Difficulty: Moderate EPSS 1.35% · P71

Affected Version Matrix 1

VendorProduct Version RangeStatus
RURBAN GD < 2.86 affected
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I. Basic Information for CVE-2026-11526

Vulnerability Information
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Vulnerability Title
GD versions before 2.86 for Perl allow OS command injection and file overwrite via a 2-arg open() of filename arguments in _make_filehandle
Source: CVE Program / CVE List V5
Vulnerability Description
GD versions before 2.86 for Perl allow OS command injection and file overwrite via a 2-arg open() of filename arguments in _make_filehandle. GD::Image::_make_filehandle opens a filename argument with Perl's 2-arg open(), so a filename that begins or ends with a pipe ("| cmd", "cmd |") or begins with a redirect ("> path", ">> path") is run as a command or redirect rather than opened as a file. _make_filehandle is the single open path behind every filename-accepting constructor (new, newFromPng, newFromJpeg, and the rest); the in-memory *Data variants do not open a path and are unaffected. Any caller that forwards untrusted input to one of these constructors as a pathname can run an arbitrary command or truncate a file under the process UID.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Reini Urban GD 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Reini Urban GD是德国Reini Urban个人开发者的一款嵌入式服务器软件。 Reini Urban GD 2.86之前版本存在安全漏洞，该漏洞源于在_make_filehandle中使用2-arg open()处理文件名参数，可能导致OS命令注入和文件覆盖。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
RURBAN GD 0 ~ 2.86 -

II. Public POCs for CVE-2026-11526

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III. Intelligence Information for CVE-2026-11526

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Patches & Fixes for CVE-2026-11526 (2)

IV. Related Vulnerabilities

Same vendor: RURBAN
Same weakness: CWE-78

V. Comments for CVE-2026-11526

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