CVE-2026-25961
HIGH EPSS 35.6%
Published Feb 9, 20264mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
Published Feb 9, 2026 4mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality High
Integrity High
Availability High
Threat Intelligence
EPSS Exploit Probability
35.6% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available
Weaknesses 2
CWE-295
CWE-494
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| sumatrapdfreader | sumatrapdf | * | ≥3.5 – ≤3.5.2 |
References 1
- github.com https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-xpm2-rr5m-x96q
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.