Vulnerability · Published Oct 20, 2026 · Assigned by VulnCheck
CVE-2026-113679HarfBuzz 8.0.0 through 14.6.0 Out-of-Bounds Write via WebAssembly font_glyph_to_string
High 7.0
In plain English
A high-severity out-of-bounds write in harfbuzz from harfbuzz. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).
Severity (CVSS 3.1)7.0High
Exploit odds (30 days)0.2%top 93.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | harfbuzz | no fix listed | DEBIAN-CVE-2026-113679 |
| Debian:13 | harfbuzz | no fix listed | DEBIAN-CVE-2026-113679 |
| Debian:14 | harfbuzz | no fix listed | DEBIAN-CVE-2026-113679 |
| Ubuntu:22.04:LTS | harfbuzz | no fix listed | UBUNTU-CVE-2026-113679 |
| Ubuntu:24.04:LTS | harfbuzz | no fix listed | UBUNTU-CVE-2026-113679 |
| Ubuntu:26.04:LTS | harfbuzz | no fix listed | UBUNTU-CVE-2026-113679 |
| Ubuntu:26.10 | harfbuzz | no fix listed | UBUNTU-CVE-2026-113679 |
Affected products (as reported)
Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- https://github.com/harfbuzz/harfbuzz/pull/6414 patch, issue-tracking
- https://github.com/harfbuzz/harfbuzz/commit/5e821de8256d01780566b5c8ab7886fae4c93da8 patch
- https://github.com/harfbuzz/harfbuzz/blob/14.6.0/src/hb-wasm-api-list.hh#L85 technical-description
- https://github.com/harfbuzz/harfbuzz/blob/14.6.0/src/hb-wasm-api-font.hh#L115-L123 technical-description
- VulnCheck Advisory: HarfBuzz 8.0.0 through 14.6.0 Out-of-Bounds Write via WebAssembly font_glyph_to_string third-party-advisory