TI-2026-69815 Aliases CVE-2026-107735

SumatraPDF restriction INI file never revokes any permission

MEDIUM 60CWE-636Published 2026-10-08 · Updated 2026-10-09

Key facts

Attack vector: Local
Privileges required: Low
User interaction: Passive
Attack complexity: Low
Attack requirements: Present
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

SumatraPDF 3.6.1 and earlier has a fail-open flaw (CWE-636) in policy initialization. InitializePolicies() starts with all permissions granted and only adds permission bits from sumatrapdfrestrict.ini, so the file never revokes any permission. A local user can bypass configured disk, network, printing, registry, clipboard, preference, and fullscreen restrictions when this INI file is deployed, including a malformed file or zero-valued permission settings.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00172 6th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
sumatrapdfreader	sumatrapdf	up to 3.6.1	—	No fix listed	CNA

sumatrapdf Vendorsumatrapdfreader Affected up to 3.6.1 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:sumatrapdfreader:sumatrapdf::::::::	—	—	sumatrapdfreader

cpe:2.3:a:sumatrapdfreader:sumatrapdf:*:*:*:*:*:*:*:* Versions — — ·sumatrapdfreader

Remediation

The sources list no fixed version for SumatraPDF. The -restrict command-line path is not affected.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

2026-10-09 Threatist record created from CVE-2026-107735
2026-10-10 CISA SSVC decision points changed

References

Other 2

TI-2026-18936 SumatraPDF has an Untrusted Search Path in sumatrapdf/src/AppTools.cpp CVSS 3.1HIGH 8.6
TI-2025-35489 A null pointer dereference vulnerability was discovered in SumatraPDF 3.5.2 during the… CVSS 3.1HIGH 7.3
TI-2012-04514 SumatraPDF 2.1.1/MuPDF 1.0 allows remote attackers to cause an Integer Overflow in the… CVSS 3.1HIGH 7.8
TI-2026-69819 Argument injection in SumatraPDF selection translation on Windows CVSS 4.0HIGH 7.1
TI-2026-69814 SumatraPDF: SyncTeX Argument Injection in Inverse Search Enables Arbitrary Command Execution via External Editors CVSS 4.0HIGH 7.1
TI-2026-69813 Null pointer dereference in SumatraPDF CmdExec crashes the reader CVSS 4.0MEDIUM 6.8

See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences