CVE-2026-107738CWE-125

CVE-2026-107738

published October 9, 2026

CVSS
6.8
EPSS
0%
Percentile
1.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
6.8 · NONE
CVSS v4.0
6.8 · CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00120 · 1.7th percentile
Weakness
CWE-125 · Out-of-bounds Read
Published
2026-10-09T03:16Z
References (2)
https://github.com/sumatrapdfreader/sumatrapdf/commit/62254ed6d781ceb5cd16489bb423e7f591cd72c4 · [email protected]https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-33jg-vxm6-8mxx · [email protected]
EPSS history
Timeline
  • 10 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 08 OCT 22:35Z
    SumatraPDF: Untrusted binary record offset used without lower-bound validation
    cvelistv5
  • 08 OCT 22:35Z
    SumatraPDF: Untrusted binary record offset used without lower-bound validation
    cvelistv5