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CVE PROGRAM SOURCE RECORD5.3 Medium

CVE-2026-33721

MapServer has heap buffer overflow in SLD `Categorize` Threshold parsing

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

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 more than 100 Threshold elements inside a ColorMap/Categorize structure (commonly reachable via WMS GetMap with SLD_BODY). Version 8.6.1 patches the issue.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

MapServer MapServer

  • >= 4.2, < 8.6.1affected

References