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Vulnerabilities ›

CVE-2026-25961

High ⚡ Exploit Available

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

CWE-295 — Weakness Type

                    Published: Feb 9, 2026                      ·  Modified: Feb 28, 2026                      ·  Source: NVD                

CVSS v3

7.5

🔗 NVD Official

📄 Description (English)

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.

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Queued for AI Analysis

This CVE will be auto-analyzed on the next cron run.

🔗 References & Sources 1

https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-xpm2-rr5m-x96q

security-advisories@github.com

Exploit Vendor Advisory

📦 Affected Products / CPE 1 entries

sumatrapdfreader:sumatrapdf

📊 CVSS Score

7.5

/ 10.0 — High

📊 CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack VectorN — None / Network

Attack ComplexityH — High

Privileges RequiredN — None / Network

User InteractionR — Required

ScopeU — Unchanged

ConfidentialityH — High

IntegrityH — High

AvailabilityH — High

📋 Quick Facts

Severity High

CVSS Score7.5

CWECWE-295

EPSS0.02%

Exploit ✓ Yes

Patch ✓ Yes

Published 2026-02-09

Source Feed nvd

Views 1

🏷️ Tags

exploit-available CWE-295

🏢 Vendor Advisories

🔗 https://github.com/sumatrapdfreader/sumatrapdf/secur...

⚡ Actions

🔗 NVD Official Page ⚡ Exploit-DB Search 🐙 GitHub PoC Search 🎯 MITRE ATT&CK 📊 CVE Details

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