Bug 2559166

Summary:	CVE-2026-113679 harfbuzz: HarfBuzz: Out-of-bounds write via crafted font in WebAssembly shaper [fedora-rawhide]
Product:	[Fedora] Fedora	Reporter:	Joel Chamberlain <jochambe>
Component:	harfbuzz	Assignee:	Parag Nemade <pnemade>
Status:	NEW ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	i18n-bugs, kalevlember, moceap, pnemade
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["faf64dd7-55f2-4786-9d2d-5972f141725c"]}
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Doc Text:		Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2556270

Description Joel Chamberlain 2026-10-22 17:08:08 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.