Bug 2537978 (CVE-2026-63272)

Summary:	CVE-2026-63272 libreoffice: LibreOffice: Heap buffer overflow in WMF text record import
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in LibreOffice. When processing embedded Windows Metafile (WMF) graphics, a heap buffer overflow can occur during the import of text records. This vulnerability arises because the application reads the character advance values and text length independently, which can lead to a mismatch and out-of-bounds memory access. A remote attacker could exploit this flaw by crafting a malicious WMF file, potentially leading to a denial of service or arbitrary code execution.	Story Points:	---
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Last Closed:		Type:	---
Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-09-22 16:24:26 UTC

LibreOffice can import WMF graphics, which may be embedded in documents. A heap buffer overflow existed when importing a text record that carries its own character advance widths. The count of advance values and the length of the text were read separately from the file and were not required to agree, so drawing the text walked the advance array by character position and ran past its end when the array was the shorter of the two. In fixed versions an advance array shorter than its text is ignored.