CVE-2026-107730 Details
Description
SumatraPDF is a multi-format reader for Windows. In 3.7.0.22298, LitParseHeader() in src/LitDoc.cpp computes the attacker-controlled hdrLen + nPieces * 16 section offset using signed 32-bit arithmetic without validating the complete result. When the component values make that aggregate calculation overflow to a negative value, pointer construction reaches an invalid read in LitU32(), causing deterministic application termination. The supplied evidence does not demonstrate code execution, information disclosure, arbitrary read, or integrity impact. No fixed version is available as of this review.
A denial-of-service vulnerability has been identified in SumatraPDF version 3.7.0.22298. The issue arises in the LIT header parsing function, where an integer overflow occurs due to the use of signed 32-bit arithmetic. This flaw allows an attacker to craft a file that manipulates header values, causing the calculated offset to wrap around to a negative value. As a result, the application attempts to read from an invalid memory location, leading to a crash. The vulnerability has been confirmed in the official signed SumatraPDF prerelease on Windows 11 x64.
Users are advised to avoid opening untrusted .lit files until a patched version of SumatraPDF is available. The vulnerability has been acknowledged by the maintainer, and the fix has been committed, but a release version containing the patch is not yet available.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 8, 2026CISA-ADP
Assessed Oct 9, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/sumatrapdfreader/sumatrapdf/commit/10a83278a5a6f67194dedfb67c47474d22ecfe4b | [email protected] | Source CodeVendor |
| https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-vfpj-qhvj-92wg | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-190 | Integer Overflow or Wraparound | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| SumatraPDF | 3.7.0.22298 |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 9, 2026 | CVE Modified | CISA-ADP |
| Oct 8, 2026 | New CVE Received | [email protected] |