CVE-2026-25961
7.5
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploitability: 1.6 / Impact: 5.9
Source: NVD
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.
Affected (1)
Products: Sumatrapdfreader: Sumatrapdf
Configuration A
| Vulnerable Software | Affected Versions |
|---|---|
| From 3.5 to 3.5.2 |
Related CWEs
CWE-295
Improper Certificate Validation
The product does not validate, or incorrectly validates, a certificate.
CWE-494
Download of Code Without Integrity Check
The product downloads source code or an executable from a remote location and executes the code without sufficiently verifying the origin and integrity of the code.
References (1)
Source: security-advisories@github.com
ExploitVendor Advisory
Timeline
No history available yet.