---
id: CVE-2026-58496
title: 'ThorVG: Out-of-bounds Read in SFNT/TTF Font Loader via Memory API'
summary: >-
  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 …
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-125
vendor: thorvg
product: thorvg
affected:
  - thorvg < 1.0.7
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T22:18:34.301Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-58496'
references:
  - url: 'https://github.com/thorvg/thorvg/security/advisories/GHSA-crfw-c34f-vqrj'
    label: 'https://github.com/thorvg/thorvg/security/advisories/GHSA-crfw-c34f-vqrj'
  - url: >-
      https://github.com/thorvg/thorvg/commit/1dc232a33535946b5eed5fd65e993b13226da0ca
    label: >-
      https://github.com/thorvg/thorvg/commit/1dc232a33535946b5eed5fd65e993b13226da0ca
  - url: 'https://github.com/thorvg/thorvg/releases/tag/v1.0.7'
    label: 'https://github.com/thorvg/thorvg/releases/tag/v1.0.7'
tags:
  - cve.org
ingestedAt: '2026-10-27T22:58:58.460Z'
---

## Overview

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.

## Affected

- `thorvg < 1.0.7`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.