Bug 2488966 (CVE-2026-6040)

Summary: CVE-2026-6040 libreoffice: LibreOffice: Heap use-after-free allows arbitrary code execution via malformed ODF number format
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
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 vulnerability was found in LibreOffice. If a user inadvertently opens a malicious OpenDocument Format (ODF) file, an attacker could execute unauthorized code and potentially gain full control of the system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2490285    
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Description OSIDB Bzimport 2026-06-15 18:01:54 UTC 
A heap use-after-free existed when importing the blank-width characters of an ODF number format. A position value read from the document was not checked against the length of the format-code string, so a malformed number format could be processed against memory outside that string. In fixed versions the position is bounds-checked before use.