CVE-2026-113679

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.

CVSS 4.0

7.3CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

7.0CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 6% of CVEs (scores of 2026-10-25)

CWE

CWE-787

Published

2026-10-20

Modified

2026-10-20

Record from

the NVD, synced 2026-10-21

References

• 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-list.hh#L85
• https://github.com/harfbuzz/harfbuzz/commit/5e821de8256d01780566b5c8ab7886fae4c93da8
• 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

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