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CVE-2026-58496— ThorVG: Out-of-bounds Read in SFNT/TTF Font Loader via Memory API

Quick assessment

Affected
thorvg thorvg
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Thor Vector Graphics（ThorVG）是一款可用于生产环境的矢量图形引擎。在 1.0.7 版本之前， 中 字体加载器的 函数会读取 至 以识别字体类型，但并未先检查输入缓冲区是否至少包含四个字节。若通过 等公共 API 直接从内存加载尺寸过小的字体，将导致越界读取。若通过文件路径并使用 加载，由于页面对齐机制可能掩盖该读取问题；而直接通过内存加载的 API 则会直接暴露此漏洞。具体取决于内存布局，格式错误且过短的字体可能导致应用程序崩溃，或泄露相邻的堆内存。该问题已在 1.0.7 版本中修复。

CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-58496

Vulnerability Information
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Vulnerability Title
ThorVG: Out-of-bounds Read in SFNT/TTF Font Loader via Memory API
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
thorvg thorvg < 1.0.7 -

II. Public POCs for CVE-2026-58496

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III. Intelligence Information for CVE-2026-58496

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Other References for CVE-2026-58496 (3)

IV. Related Vulnerabilities

Same product: thorvg
Same vendor: thorvg
Same weakness: CWE-125