ThorVG up to 1.0.6 SFNT/TTF Font Loader tvgSfntLoader.cpp SfntLoader::gen out-of-bounds

Summaryinfo

A vulnerability classified as critical was found in ThorVG up to 1.0.6. The impacted element is the function SfntLoader::gen of the file tvgSfntLoader.cpp of the component SFNT/TTF Font Loader. Executing a manipulation can lead to out-of-bounds. This vulnerability appears as CVE-2026-58496. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in ThorVG up to 1.0.6. It has been declared as critical. This vulnerability affects the function SfntLoader::gen of the file tvgSfntLoader.cpp of the component SFNT/TTF Font Loader. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Thor Vector Graphics (ThorVG) is a production-ready vector graphics engine. Prior to 1.0.7, the `SFNT/TTF` font loader's `SfntLoader::gen` function in `tvgSfntLoader.cpp` reads `data[0] through data[3]` to identify the font type without first checking that the input buffer contains at least four bytes. Loading an undersized font directly from memory through public APIs such as `tvg::Text::load` causes an out-of-bounds read. Loading through a file path using `mmap` can mask the read because of page alignment; the memory-loading API directly exposes it. Depending on memory layout, a malformed short font may crash the consuming application or disclose adjacent heap memory. This issue is fixed in version 1.0.7.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-58496 since 06/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 1.0.7 eliminates this vulnerability.

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Productinfo

Name

• ThorVG

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6

Website

• Product: https://github.com/thorvg/thorvg/

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