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ZDI-26-781: LibreOffice EMF+ Brush Integer Overflow Remote Code Execution Vulnerability

The Document Foundation LibreOffice · CVE-2026-6045 ZDI-26-781
0 news outlets0 CERTs and agencies0 researchers

What is it?

LibreOffice can import EMF+ graphics, which may be embedded in documents. A heap buffer overflow existed when importing an EMF+ gradient brush. The number of gradient blend points was read from the file and used to compute an allocation size, but that multiplication could overflow, so a small buffer was allocated and then filled as if it were large, writing past its end. In fixed versions the blend-point count is checked against the data actually available before allocating.

Evidence

Research (1)

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
5.4
EPSS
0.2%
First seen
6 d ago
Status
confirmed

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