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 u…

EPSS: 0.002 (8.9th 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.