CVE-2026-107731 — SumatraPDF is a multi-format reader for Windows.
Description
SumatraPDF is a multi-format reader for Windows. In 3.7.0.22298, four independently reachable range-validation variants in src/LitDoc.cpp allow file-controlled offsets and sizes to overflow, narrow to negative values, or wrap before incomplete bounds checks. The affected calculations include contentOffset, the directory expression dirOff64 + dirLen64, and the decoded-section offset + size, along with secondary-header range handling. Opening a crafted LIT file that reaches one of these variants can cause invalid pointer reads and deterministic application termination. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.
CVSS v3.1 base metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HMedium severity
Band computed from the CVSS base score, not the source's own label — so it means the same thing across every feed.
AV
Local
Attack Vector
AC
Low
Attack Complexity
PR
None
Privileges Required
UI
Required
User Interaction
S
Unchanged
Scope
C
None
Confidentiality
I
None
Integrity
A
High
Availability
References
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