---
id: CVE-2026-113679
title: >-
  HarfBuzz 8.0.0 through 14.6.0 Out-of-Bounds Write via WebAssembly
  font_glyph_to_string
summary: >-
  HarfBuzz 8.0.0 through 14.6.0 contains an out-of-bounds write vulnerability in
  the experimental WebAssembly shaper because the font_glyph_to_string import
  has a wrong WAMR signature. Attackers can supply a crafted font whose wasm
  module …
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: harfbuzz
product: harfbuzz
affected:
  - harfbuzz >= 8.0.0 <= 14.6.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-20T16:21:23.456923Z'
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T16:21:50.578Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-113679'
references:
  - url: 'https://github.com/harfbuzz/harfbuzz/pull/6414'
  - url: >-
      https://github.com/harfbuzz/harfbuzz/commit/5e821de8256d01780566b5c8ab7886fae4c93da8
  - url: >-
      https://github.com/harfbuzz/harfbuzz/blob/14.6.0/src/hb-wasm-api-list.hh#L85
  - url: >-
      https://github.com/harfbuzz/harfbuzz/blob/14.6.0/src/hb-wasm-api-font.hh#L115-L123
  - url: >-
      https://www.vulncheck.com/advisories/harfbuzz-8.0.0-through-14.6.0-out-of-bounds-write-via-webassembly-font-glyph-to-string
    label: >-
      VulnCheck Advisory: HarfBuzz 8.0.0 through 14.6.0 Out-of-Bounds Write via
      WebAssembly font_glyph_to_string
tags:
  - cve.org
ingestedAt: '2026-10-20T16:10:53.299Z'
---

## Overview

HarfBuzz 8.0.0 through 14.6.0 contains an out-of-bounds write vulnerability in the experimental WebAssembly shaper because the font_glyph_to_string import has a wrong WAMR signature. Attackers can supply a crafted font whose wasm module places the output buffer near linear memory's end, writing glyph-name bytes into host memory to crash or corrupt applications.

## Affected

- `harfbuzz >= 8.0.0 <= 14.6.0`

## Remediation

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