SumatraPDFReader SumatraPDF up to 3.6.1 TIFF MaybeFlipBitmap stack-based overflow

Summaryinfo

A vulnerability has been found in SumatraPDFReader SumatraPDF up to 3.6.1 and classified as critical. This impacts the function MaybeFlipBitmap of the component TIFF Handler. Performing a manipulation results in stack-based overflow. This vulnerability is reported as CVE-2026-107736. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, was found in SumatraPDFReader SumatraPDF up to 3.6.1. This affects the function MaybeFlipBitmap of the component TIFF Handler. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). 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 3.6.1 and earlier, MaybeFlipBitmap() asks GDI+ to read the attacker-controlled PropertyTagOrientation size through GetPropertyItem() while supplying only a fixed 64-byte buf on the stack. Opening a crafted TIFF with enough EXIF Orientation values can cause attacker-selected bytes to overwrite stack control data, while tested builds terminate through the stack cookie check. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-107736 since 10/08/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price 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.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• SumatraPDFReader

Name

• SumatraPDF

Version

• 3.6.0
• 3.6.1

Website

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

CPE 2.3info

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CPE 2.2info

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Entryinfo

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