Bug 2491185 (CVE-2026-56404)

Summary: CVE-2026-56404 libexpat: libexpat: Arbitrary Code Execution via integer overflow in addBinding
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: gotiwari, jhorak, mvyas, rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in libexpat. This vulnerability, an integer overflow in the `addBinding` function, could allow a local attacker to execute arbitrary code. By exploiting this, an attacker could gain control over the affected system, compromising its confidentiality and integrity.
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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: 2508400, 2508401    
Bug Blocks:    

Description OSIDB Bzimport 2026-06-21 16:01:22 UTC
libexpat before 2.8.2 has an integer overflow in addBinding.