Improper Validation of Array Index Affecting mapserver package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published22 Sept 2026
- disclosed27 May 2026
Introduced: 27 May 2026
CVE-2026-45104 (opens in a new tab)How to fix?
There is no fixed version for Echo:latest mapserver.
NVD Description
Note: Versions mentioned in the description apply only to the upstream mapserver package and not the mapserver package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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.