CVE-2026-33721
5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| MapServer | MapServer | >= 4.2, < 8.6.1 | affected |
Weaknesses
- CWE-787: CWE-787: Out-of-bounds Write
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: yes
- Technical Impact: partial
CVE Program Container
Additional References
References
- https://github.com/MapServer/MapServer/security/advisories/GHSA-cv4m-mr84-fgjp
- https://github.com/MapServer/MapServer/releases/tag/rel-8-6-1
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