---
id: "CVE-2025-27363"
kind: "vulnerability"
aliases: ["CVE-2025-27363"]
title: "An out of bounds write exists in FreeType versions 2.13.0 and below (newer versions of FreeType are not vulnerable)\u2026"
severity: "high"
cvss: 8.1
epss: null
exploited: true
status: "open"
category: "package"
products: [{"name": "FreeType FreeType", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "freetype", "fixed": [], "affected": "<= 2.13.0", "ecosystem": "vendor"}, {"name": "debian linux", "fixed": [], "affected": "= 11.0", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["embedded", "exploited", "freetype", "linux", "package", "self-hosted"]
not_affected_if: ["no-untrusted-fonts"]
published_at: "2025-03-11T14:15:25+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T22:29:05+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-27363", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-27363", "first_seen_at": "2026-10-23T22:29:05+00:00"}]
---

# An out of bounds write exists in FreeType versions 2.13.0 and below (newer versions of FreeType are not vulnerable)…

FreeType, the font rendering library used by many apps and operating systems, has an out-of-bounds write when parsing TrueType GX and variable font subglyph data. A crafted font file can let an attacker run arbitrary code in the process that opens it.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:FreeType FreeType affected ? fixed ?
- vendor:freetype affected <= 2.13.0 fixed ?
- vendor:debian linux affected = 11.0 fixed ?

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-27363
- 2026-10-23T22:29:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2025-27363

## From the sources

An out of bounds write exists in FreeType versions 2.13.0 and below (newer versions of FreeType are not vulnerable) when attempting to parse font subglyph structures related to TrueType GX and variable font files. The vulnerable code assigns a signed short value to an unsigned long and then adds a static value causing it to wrap around and allocate too small of a heap buffer. The code then writes up to 6 signed long integers out of bounds relative to this buffer. This may result in arbitrary code execution. This vulnerability may have been exploited in the wild.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_