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    <lastBuildDate>Mon, 05 Oct 2026 02:11:28 +0000</lastBuildDate>
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      <title>CVE-2026-45104 — MapServer: NULL pointer dereference in SLD `&lt;ElseFilter&gt;` rule parsing reachable via WMS `SLD_BODY`</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-45104</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; MapServer&lt;/p&gt;
&lt;p&gt;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 &amp;lt;Rule&amp;gt; carrying &amp;lt;ElseFilter/&amp;gt; — 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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; MapServer&lt;/p&gt;
&lt;p&gt;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 &amp;lt;Rule&amp;gt; carrying &amp;lt;ElseFilter/&amp;gt; — 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.&lt;/p&gt;</content:encoded>
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