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.
Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| mapserver | 4.2.0 | 8.6.1 |
References
Similar Threats
- High CVE-2026-45104
- Unknown DEBIAN-CVE-2026-45104
- Unknown UBUNTU-CVE-2026-45104
- Medium CVE-2026-42030
- Unknown DEBIAN-CVE-2026-42030
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