CVE-2026-107735: CWE-636: Not Failing Securely ('Failing Open') in sumatrapdfreader sumatrapdf
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.
CVSS v4.0
Score 5.4medium
Affected software
sumatrapdfreader
sumatrapdf
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-08T17:21:52.977Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ac81de02cdf04f6563fadfd
Added to database: 10/08/2026, 22:49:04 UTC
Last updated: 10/08/2026, 22:49:04 UTC
Views: 1
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