Description
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.
Problem types
CWE-190 Integer Overflow or Wraparound
Product status
25.8 (25.8 series) before < 25.8.7
26.2 (26.2 series) before < 26.2.3
Credits
Anthropic (automated discovery using Claude)
Trail of Bits (triage and validation)
References
www.libreoffice.org/...-us/security/advisories/cve-2026-6045