Description
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.
INFO
Published Date :
2026-02-09T21:34:05.203Z
Last Modified :
2026-02-10T15:57:28.303Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-25961 vulnerability.
| Vendors | Products |
|---|---|
| Sumatrapdfreader |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-25961.
CVSS Vulnerability Scoring System
Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact