Bug 2482360 (CVE-2026-45104) - CVE-2026-45104 mapserver: MapServer: Denial of Service via malformed SLD in WMS SLD_BODY parameter
Summary: CVE-2026-45104 mapserver: MapServer: Denial of Service via malformed SLD in W...
Keywords:
Status: NEW
Alias: CVE-2026-45104
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
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Depends On: 2482505 2482506
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-27 20:01 UTC by OSIDB Bzimport
Modified: 2026-05-28 10:00 UTC (History)
0 users

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Description OSIDB Bzimport 2026-05-27 20:01:34 UTC 
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.
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