MapServer is a system for developing web-based GIS applications. From 6.4.0 to before 8.6.3, msSLDParseUserStyle always calls _SLDApplyRuleValues(psRule, psLayer, 1); for any <Rule> carrying <ElseFilter/> — it assumes msSLDParseRule added one class. When the rule has no symbolizer (a structurally valid SLD), msSLDParseRule adds zero, and _SLDApplyRuleValues ends up indexing _class[-1], resulting in a NULL pointer dereference. A 200-byte well-formed SLD via the WMS SLD_BODY= parameter is enough to trigger this, no auth required. This vulnerability is fixed in 8.6.3.
References
| Link | Resource |
|---|---|
| https://github.com/MapServer/MapServer/security/advisories/GHSA-4h8g-378q-r75m | Exploit Mitigation Vendor Advisory |
Configurations
History
02 Jun 2026, 18:19
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/MapServer/MapServer/security/advisories/GHSA-4h8g-378q-r75m - Exploit, Mitigation, Vendor Advisory | |
| First Time |
Osgeo mapserver
Osgeo |
|
| CPE | cpe:2.3:a:osgeo:mapserver:*:*:*:*:*:*:*:* |
27 May 2026, 20:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-27 20:16
Updated : 2026-06-02 18:19
NVD link : CVE-2026-45104
Mitre link : CVE-2026-45104
CVE.ORG link : CVE-2026-45104
JSON object : View
Products Affected
osgeo
- mapserver