CVE-2026-107738Medium· 6.8▾ Sunlit

SumatraPDF is a multi-format reader for Windows

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score37/ 100 · Low

impact 37.4 · likelihood 0 · exploitation 0

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Proof of concept

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Published

Oct 8, 2026

Updated

Oct 14, 2026

CVSS

6.8

Vendor

sumatrapdfreader

Product

sumatrapdf

CWE

CWE-125

Depth score

37 · Low

EPSS

0.12% · p2

Platforms

—

Source

NVD

Vector

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

CISA SSVC

decided 2026-10-14

Exploitation: none
Automatable: no
Technical impact: partial

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.

EPSS history

Exploit-prediction probability, daily snapshots since Oct 10.

0.1% → 0.1%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

5 events · 7 days

Oct 8, 2026Published
Disclosed via NVD
Oct 10, 2026EPSS first tracked
0.1%
Oct 14, 2026Record revised
Last analysed / modified upstream
Oct 15, 2026CVSS changed
— → 6.8
Oct 15, 2026Severity changed
none → medium

sumatrapdfreader CWE-125 #nvd #cve.org

Affected

sumatrapdf <= 3.6.1

Full technical detail▾

Overview

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.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Change history

Field changes observed since this record was first indexed.

Oct 15, 2026CVSS — → 6.8
Oct 15, 2026Severity none → medium

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org

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