CVE-2026-107738
SumatraPDF: Untrusted binary record offset used without lower-bound validation
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-125 |
| Vendor | sumatrapdfreader |
| Product | sumatrapdf |
| Published | Oct 8, 2026 |
Stay Ahead of the Next One
Get instant alerts for sumatrapdfreader sumatrapdf
Be the first to know when new unknown vulnerabilities affecting sumatrapdfreader sumatrapdf are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
Affected Versions
sumatrapdfreader / sumatrapdf
<= 3.6.1