Windows
CVE-2026-23512
HIGH
Severity by source
AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionGitHub Advisory
SumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, there is a Untrusted Search Path vulnerability when Advanced Options setting is trigger. The application executes notepad.exe without specifying an absolute path when using the Advanced Options setting. On Windows, this allows execution of a malicious notepad.exe placed in the application's installation directory, leading to arbitrary code execution.
AnalysisAI
SumatraPDF 3.5.2 and earlier on Windows contains an untrusted search path vulnerability in the Advanced Options feature that allows arbitrary code execution through a malicious notepad.exe placed in the application directory. An attacker with local access can exploit this when a user triggers the Advanced Options setting, as the application fails to specify an absolute path when launching notepad.exe. Public exploit code exists for this vulnerability, and a patch is available.
Technical ContextAI
Classified as CWE-426 (Untrusted Search Path). Affects Sumatrapdf. SumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, there is a Untrusted Search Path vulnerability when Advanced Options setting is trigger. The application executes notepad.exe without specifying an absolute path when using the Advanced Options setting. On Windows, this allows execution of a malicious notepad.exe placed in the application's installation directory, leading to arbitrary code execution.
RemediationAI
A vendor patch is available — apply it immediately.
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Same weakness CWE-426 – Untrusted Search Path
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External POC / Exploit Code
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