sumatrapdfreader SumatraPDF up to 3.7.0.22298 LIT File src/LitDoc.cpp memory corruption

Summaryinfo

A vulnerability identified as critical has been detected in sumatrapdfreader SumatraPDF up to 3.7.0.22298. This issue affects some unknown processing of the file src/LitDoc.cpp of the component LIT File Handler. Performing a manipulation results in memory corruption. This vulnerability was named CVE-2026-107731. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in sumatrapdfreader SumatraPDF up to 3.7.0.22298. This affects some unknown functionality of the file src/LitDoc.cpp of the component LIT File Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

SumatraPDF is a multi-format reader for Windows. In 3.7.0.22298, four independently reachable range-validation variants in src/LitDoc.cpp allow file-controlled offsets and sizes to overflow, narrow to negative values, or wrap before incomplete bounds checks. The affected calculations include contentOffset, the directory expression dirOff64 + dirLen64, and the decoded-section offset + size, along with secondary-header range handling. Opening a crafted LIT file that reaches one of these variants can cause invalid pointer reads and deterministic application termination. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-107731 since 10/08/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/09/2026).

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

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Productinfo

Vendor

• sumatrapdfreader

Name

• SumatraPDF

Version

• 3.7.0.22298

Website

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

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