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CVE-2026-63272— Heap buffer overflow in WMF text record import

Quick assessment

Affected
The Document Foundation LibreOffice
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 5.4 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
The Document Foundation LibreOffice 26.2< < 26.2.5 affected
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I. Basic Information for CVE-2026-63272

Vulnerability Information

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Vulnerability Title
Heap buffer overflow in WMF text record import
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
The Document Foundation LibreOffice 26.2 ~ < 26.2.5 -

II. Public POCs for CVE-2026-63272

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III. Intelligence Information for CVE-2026-63272

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Other References for CVE-2026-63272 (1)

Same Patch Batch · The Document Foundation · 2026-09-22 · 7 CVEs total

CVE-2026-63278 6.7 MEDIUM Package URLs can be used to exfiltrate arbitrary INI file values and environment variables
CVE-2026-63279 5.4 MEDIUM Out of bounds read in PICT image import
CVE-2026-63274 5.4 MEDIUM Heap buffer overflow in PDF import stream handling
CVE-2026-63273 5.4 MEDIUM Heap buffer overflow in PDF import encryption handling
CVE-2026-63276 5.4 MEDIUM Stack buffer overflow in CFF to Type 1 font conversion
CVE-2026-63275 5.4 MEDIUM Stack buffer overflow in CFF font hint handling

IV. Related Vulnerabilities

Same product: LibreOffice
Same vendor: The Document Foundation
Same weakness: CWE-787

V. Comments for CVE-2026-63272

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