Bug 2488960 (CVE-2026-6047)

Summary: CVE-2026-6047 libreoffice: LibreOffice: Denial of service via heap buffer overflow in OOXML document processing
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: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in LibreOffice. This vulnerability, a heap buffer overflow, occurs when processing specially crafted OOXML (Office Open XML) documents. An attacker could create a malicious document that, when opened, causes a write beyond the intended memory boundary during the replaying of deferred parser events for text box elements. This could lead to a denial of service, making the application unavailable.
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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: 2489095    
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Description OSIDB Bzimport 2026-06-15 18:01:33 UTC 
LibreOffice can import documents in the OOXML format (DOCX). A heap buffer overflow existed when replaying deferred parser events for a text box element. A handler object was assumed to be of one type and written to at that type's field layout, but it could be a smaller object, so the write landed past the end of the allocation. In fixed versions the type is checked before the write.