CVE-2026-25961
High · 7.5CVSS
7.5
EPSS
0.5%
Published
Feb 9, 2026
CISA due date
—
The record
SumatraPDF is a multi-format reader for Windows. In 3.5.0 through 3.5.2, SumatraPDF's update mechanism disables TLS hostname verification (INTERNET_FLAG_IGNORE_CERT_CN_INVALID) and executes installers without signature checks. A network attacker with any valid TLS certificate (e.g., Let's Encrypt) can intercept the update check request, inject a malicious installer URL, and achieve arbitrary code execution.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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