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I. Basic Information for CVE-2026-25961
Vulnerability Information
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Vulnerability Title
SumatraPDF Update MITM -> Arbitrary Code Execution
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
证书验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
sumatrapdf 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
sumatrapdf是sumatrapdfreader开源的一个PDF阅读器。 SumatraPDF 3.5.0版本至3.5.2版本存在安全漏洞，该漏洞源于更新机制禁用TLS主机名验证且不检查安装程序签名，可能导致任意代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
sumatrapdfreadersumatrapdf >= 3.5.0, <= 3.5.2 -
II. Public POCs for CVE-2026-25961
#POC DescriptionSource LinkShenlong Link
1SumatraPDF versions 3.5.0 to 3.5.2 disable TLS hostname verification during update checks # (using INTERNET_FLAG_IGNORE_CERT_CN_INVALID) and do not perform any signature or integrity # validation on the downloaded installer.https://github.com/mbanyamer/CVE-2026-25961-SumatraPDF-3.5.0---3.5.2-RCEPOC Details
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III. Intelligence Information for CVE-2026-25961
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IV. Related Vulnerabilities
Same product: sumatrapdf
Same vendor: sumatrapdfreader
Same weakness: CWE-295
V. Comments for CVE-2026-25961

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