What is CVE-2026-23512?

CVE-2026-23512 is a high-severity vulnerability in Microsoft Windows, classified under Untrusted Search Path. CVSS score: 8.6/10. Published 2026-01-14.

How severe is CVE-2026-23512?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Microsoft Windows

CVE-2026-23512

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.

EPSS: 0.002 (9.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Microsoft Windows
Sumatrapdfreader Sumatrapdf — versions <= 3.5.2

Weakness classification (CWE)

CWE-426 — Untrusted Search Path

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-23512?: CVE-2026-23512 is a high-severity vulnerability in Microsoft Windows, classified under Untrusted Search Path. CVSS score: 8.6/10. Published 2026-01-14.
How severe is CVE-2026-23512?: High severity. CVSS v3 base score is 8.6 out of 10.