CVE-2026-33721 MapServer has heap buffer overflow in SLD `Categorize` Threshold parsing

MapServer is a system for developing web-based GIS applications. Starting in version 4.2 and prior to version 8.6.1, a heap-buffer-overflow write in MapServer’s SLD Styled Layer Descriptor parser lets a remote, unauthenticated attacker crash the MapServer process by sending a crafted SLD with mor...

PT-2026-28511

Name of the Vulnerable Software and Affected Versions MapServer versions 4.2 through 8.6.0 Description MapServer is a system for developing web-based GIS applications. A heap-buffer-overflow write in MapServer’s SLD Styled Layer Descriptor parser allows a remote, unauthenticated attacker to crash...