CVE-2026-107738: CWE-125: Out-of-bounds Read in sumatrapdfreader sumatrapdf
Description
SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, ChmFile::GetCharZ() narrows file-controlled unsigned string offsets from /#WINDOWS and /#IVB to signed integers without a lower-bound check. An offset that becomes negative can make the function read before the /#STRINGS buffer, causing deterministic application termination. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.
CVSS v4.0
Score 6.8medium
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: 6ac81de02cdf04f6563fae00
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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