CVE-2026-45104

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-129 CWE-476

Affected software

Vendor	Product	Versions
MapServer	MapServer	>= 6.4.0, < 8.6.3

References

https://github.com/MapServer/MapServer/security/advisories/GHSA-4h8g-378q-r75mExploit, Mitigation, Vendor Advisory

Timeline

Published: May 27, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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