sumatrapdfreader SumatraPDF up to 3.6.1 INI File sumatrapdfrestrict.ini InitializePolicies permission

Summaryinfo

A vulnerability, which was classified as problematic, has been found in sumatrapdfreader SumatraPDF up to 3.6.1. The impacted element is the function InitializePolicies of the file sumatrapdfrestrict.ini of the component INI File Handler. This manipulation causes permission. This vulnerability is registered as CVE-2026-107735. The attack needs to be launched locally. No exploit is available.

Detailsinfo

A vulnerability classified as problematic was found in sumatrapdfreader SumatraPDF up to 3.6.1. Affected by this vulnerability is the function InitializePolicies of the file sumatrapdfrestrict.ini of the component INI File Handler. The manipulation with an unknown input leads to a permission vulnerability. The CWE definition for the vulnerability is CWE-275. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, InitializePolicies() starts the sumatrapdfrestrict.ini path with gPolicyRestrictions set to Perm::All and only ORs permission bits, so the INI file never revokes permissions. Deploying SumatraPDF with this INI file, including a malformed file or zero-valued permission settings, can silently bypass configured disk, network, printing, registry, clipboard, preference, and fullscreen restrictions. The -restrict command-line path works correctly and is not affected. No fixed version is available as of this review.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-107735 since 10/08/2026. The exploitation appears to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1222 according to MITRE ATT&CK.

By approaching the search of inurl:sumatrapdfrestrict.ini it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• sumatrapdfreader

Name

• SumatraPDF

Version

• 3.6.0
• 3.6.1

Website

• Product: https://github.com/sumatrapdfreader/sumatrapdf/

CPE 2.3info

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