Dashboard / CVE-2026-115758

CVE-2026-115758

HIGH
MEDIUM Priority: 0.01 BB Relevance: 66/100
Published: 2026-11-04 Modified: 2026-11-04 First seen: 2026-11-04 Status: active

Attack Surface

Network No Auth No Interaction Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: High
PR: None
UI: None
S: X
AT: Present
VC: None
VI: High
VA: None

Description

SumatraPDF is a multi-format reader for Windows. In version 3.6.1 and earlier, HttpGet() in src/base/Http_win.cpp unconditionally passes INTERNET_FLAG_IGNORE_CERT_CN_INVALID to WinINet, disabling hostname matching for HTTPS update metadata and crash-symbol requests while retaining certificate-chain validation. A network-positioned attacker with a Windows-trusted certificate for an attacker-controlled domain can impersonate the project's update host, inject promo text and a clickable URL before update metadata validation, and provide an attacker-controlled archive to ExtractSymbols(). Installer replacement is not directly possible because HttpGetToFile() validates TLS and MaybeStartUpdateDownload() restricts the download host. No fixed version is available as of this review.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
sumatrapdfreader sumatrapdf <= 3.6.1

References & Advisories (2)

Bug Bounty Relevance

66 / 100
✓ Network accessible
✓ No authentication
✓ No user interaction

CVSS Score

8.2 / 10.0 v4.0
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.14%
Raw Score 0.001450
Percentile 3.8%
Date 2026-11-06

EPSS Trend

2026-11-06
0.00145
2026-11-05
0.00145

Intelligence Sources

mitre ref →
nvd ref →

External Links