Bug 2553403

Summary: CVE-2026-56403 expat: libexpat: Arbitrary code execution due to integer overflow in storeAtts [fedora-44]
Product: [Fedora] Fedora Reporter: Avinash Hanwate <ahanwate>
Component: expatAssignee: Tomas Korbar <tkorbar>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: 44CC: jorton, tkorbar
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["a01ca437-c6de-4383-adbb-1a797a2594ff"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2491186    

Description Avinash Hanwate 2026-10-15 12:37:47 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.

libexpat before 2.8.2 has an integer overflow in storeAtts.