---
title: "CVE-2026-113679: HarfBuzz - Out of Bounds Write"
description: "HarfBuzz 8.0.0 through 14.6.0 contains an out-of-bounds write vulnerability caused by incorrect WAMR signature in font_glyph_to_string import in the experimental WebAssembly shaper, letting attackers crash or corrupt applications by supplying crafted fonts."
url: https://panop.io/threat-heartbeat/CVE-2026-113679/
---

# CVE-2026-113679 HarfBuzz - Out of Bounds Write

HarfBuzz 8.0.0 through 14.6.0 contains an out-of-bounds write vulnerability caused by incorrect WAMR signature in font\_glyph\_to\_string import in the experimental WebAssembly shaper, letting attackers crash or corrupt applications by supplying crafted fonts.

CVSS base score 7.0 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-113679)

## Details

Type

Out of Bounds Write

Impact

Denial Of Service, Data Tampering

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Published

20 October 2026

Updated

21 October 2026

Weakness

[CWE-787](https://cwe.mitre.org/data/definitions/787.html)

## Vendor fix

Update to a version later than 14.6.0.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-113679](https://nvd.nist.gov/vuln/detail/CVE-2026-113679)
- [https://github.com/harfbuzz/harfbuzz/blob/14.6.0/src/hb-wasm-api-list.hh#L85](https://github.com/harfbuzz/harfbuzz/blob/14.6.0/src/hb-wasm-api-list.hh#L85)
- [https://github.com/harfbuzz/harfbuzz/commit/5e821de8256d01780566b5c8ab7886fae4c93da8](https://github.com/harfbuzz/harfbuzz/commit/5e821de8256d01780566b5c8ab7886fae4c93da8)
- [https://github.com/harfbuzz/harfbuzz/pull/6414](https://github.com/harfbuzz/harfbuzz/pull/6414)
- [https://www.vulncheck.com/advisories/harfbuzz-8.0.0-through-14.6.0-out-of-bounds-write-via-webassembly-font-glyph-to-string](https://www.vulncheck.com/advisories/harfbuzz-8.0.0-through-14.6.0-out-of-bounds-write-via-webassembly-font-glyph-to-string)
- [https://github.com/harfbuzz/harfbuzz/blob/14.6.0/src/hb-wasm-api-font.hh#L115-L123](https://github.com/harfbuzz/harfbuzz/blob/14.6.0/src/hb-wasm-api-font.hh#L115-L123)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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