SumatraPDFReader SumatraPDF up to 3.7.0.22298 src/LitDoc.cpp LitParseHeader integer overflow

Summaryinfo

A vulnerability classified as problematic has been found in SumatraPDFReader SumatraPDF up to 3.7.0.22298. Impacted is the function LitParseHeader of the file src/LitDoc.cpp. The manipulation leads to integer overflow. This vulnerability is listed as CVE-2026-107730. The attack must be carried out locally. There is no available exploit.

Detailsinfo

A vulnerability was found in SumatraPDFReader SumatraPDF up to 3.7.0.22298. It has been rated as problematic. This issue affects the function LitParseHeader of the file src/LitDoc.cpp. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-107730 since 10/08/2026. The exploitation is known to be easy. An attack has to be approached locally. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• SumatraPDFReader

Name

• SumatraPDF

Version

• 3.7.0.22298

Website

• Product: https://github.com/sumatrapdfreader/sumatrapdf/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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