CVE-2026-63272
MediumCVSS 5.4Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
LibreOffice can import WMF graphics, which may be embedded in documents. A heap buffer overflow exists when importing a text record that carries its own character advance widths because the count of advance values and the text length are read separately and not required to agree. In fixed versions, an advance array shorter than its text is ignored.
Risk Assessment
Opening a malicious document with an embedded WMF graphic could cause a heap buffer overflow, leading to a crash or potential code execution. This may result in remote code execution.
Recommendation
Update LibreOffice to a version that includes the fix ignoring an advance array shorter than its text. Avoid opening documents from untrusted sources.
Other vulnerabilities in LibreOffice
See all- CVE-2016-4324High
Use-after-free vulnerability in LibreOffice before 5.1.4 allows remote attackers to execute arbitrary code via a crafted RTF file, related to stylesheet and superscript tokens.
- CVE-2016-0795High
LibreOffice versions before 5.0.5 allow remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a crafted LwpTocSuperLayout record in a LotusWordPro (lwp) document.
- CVE-2014-9093High
LibreOffice versions before 4.3.5 allow remote attackers to cause a denial of service (invalid write operation and crash) and possibly execute arbitrary code via a crafted RTF file.
- CVE-2014-0247High
LibreOffice version 4.2.4 automatically executes unspecified VBA macros, which may lead to unknown impacts and attack vectors.
- CVE-2017-8358Critical
LibreOffice before 2017-03-17 has an out-of-bounds write caused by a heap-based buffer overflow related to the ReadJPEG function in vcl/source/filter/jpeg/jpegc.cxx.
- CVE-2017-7882Critical
LibreOffice before March 14, 2017, has an out-of-bounds write related to the HWPFile::TagsRead function in hwpfilter/source/hwpfile.cxx.
- CVE-2017-7870Critical
LibreOffice before 2017-01-02 has an out-of-bounds write caused by a heap-based buffer overflow related to the tools::Polygon::Insert function in tools/source/generic/poly.cxx.
- CVE-2017-7856Critical
LibreOffice before 2017-03-11 has an out-of-bounds write caused by a heap-based buffer overflow in the SVMConverter::ImplConvertFromSVM1 function.
- CVE-2016-10327Critical
LibreOffice before December 22, 2016, has an out-of-bounds write caused by a heap-based buffer overflow related to the EnhWMFReader::ReadEnhWMF function in vcl/source/filter/wmf/enhwmf.cxx.
- CVE-2026-63279Medium
LibreOffice can import PICT images, which may be embedded in documents. An out-of-bounds read occurs when importing an image that uses a colour palette because the palette index is not checked against the number of entries. In fixed versions, the palette index is limited to the entries present.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS