Bug 2559135

Summary: CVE-2026-113679 mingw-harfbuzz: HarfBuzz: Out-of-bounds write via crafted font in WebAssembly shaper [fedora-43]
Product: [Fedora] Fedora Reporter: Joel Chamberlain <jochambe>
Component: mingw-harfbuzzAssignee: Kalev Lember <kalevlember>
Status: ON_QA --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: 43CC: kalevlember, manisandro
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["faf64dd7-55f2-4786-9d2d-5972f141725c"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2556270    

Description Joel Chamberlain 2026-10-22 16:45:38 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.
Comment 1 Fedora Update System 2026-10-31 16:18:09 UTC 
FEDORA-2026-350d904ee3 (mingw-harfbuzz-11.5.1-3.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-350d904ee3
Comment 2 Fedora Update System 2026-11-01 03:18:01 UTC 
FEDORA-2026-350d904ee3 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-350d904ee3`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-350d904ee3

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.