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CVE-2026-33721

nvd nist
Published: Mar 27, 2026Modified: Jun 17, 2026

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7.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability: 3.9 / Impact: 3.6
Source: NVD

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 (1)

Products: Osgeo: Mapserver
Osgeo
1 product
Mapserver
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Mapserver
From 4.2.0 to 8.6.1

Related CWEs

CWE-787
Out-of-bounds Write
The product writes data past the end, or before the beginning, of the intended buffer.

References (3)

Source: security-advisories@github.com
ProductRelease Notes
Source: security-advisories@github.com
ExploitMitigationVendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

No history available yet.