CVE-2026-107735 Details
Description
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.
A vulnerability in SumatraPDF, a multi-format reader for Windows, allows for a silent bypass of permission restrictions through the use of a configuration file. In versions through 3.6.1, the 'InitializePolicies' function incorrectly sets the initial permission state to 'Perm::All', granting all permissions. When the application reads the 'sumatrapdfrestrict.ini' file, it only adds permissions without removing any, leading to unrestricted access despite apparent configuration. This issue affects deployments that rely on the INI file for restrictions, such as kiosks or locked-down workstations. The command-line 'restrict' flag is not impacted and works as intended.
As of now, there is no fixed version available. However, users can manually adjust the 'sumatrapdfrestrict.ini' file to ensure it is correctly formatted and does not grant excessive permissions.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 8, 2026CISA-ADP
Assessed Oct 9, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-crhm-w5qr-wjj4 | CISA-ADP | AdvisoryRemedyVendor |
| https://github.com/sumatrapdfreader/sumatrapdf/commit/f72948b59405d3ddba527789898050ef411d0bb8 | [email protected] | Source CodeVendor |
| https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-crhm-w5qr-wjj4 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-636 | Not Failing Securely ('Failing Open') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| SumatraPDF | <= 3.6.1 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 9, 2026 | CVE Modified | CISA-ADP |
| Oct 8, 2026 | New CVE Received | [email protected] |