Bug 2452066 (CVE-2026-33721) - CVE-2026-33721 MapServer: MapServer: Denial of Service via crafted Styled Layer Descriptor
Summary: CVE-2026-33721 MapServer: MapServer: Denial of Service via crafted Styled Lay...
Keywords:
Status: NEW
Alias: CVE-2026-33721
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2452126 2452127
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-27 01:02 UTC by OSIDB Bzimport
Modified: 2026-03-27 07:25 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-03-27 01:02:05 UTC 
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.
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