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CVE-2026-45104— MapServer: NULL pointer dereference in SLD `<ElseFilter>` rule parsing reachable via WMS `SLD_BODY`

Quick assessment

Affected
MapServer MapServer
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mapserver是开源地理空间（Osgeo）基金会的一套用于将空间数据和交互式地图应用程序发布到Web的开源平台。 MapServer 6.4.0版本至8.6.3之前版本存在代码问题漏洞，该漏洞源于msSLDParseUserStyle函数对带有ElseFilter的规则处理不当，可能导致空指针取消引用。

CVSS 7.5 · High EPSS 0.49% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
MapServer MapServer >= 6.4.0, < 8.6.3 affected
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I. Basic Information for CVE-2026-45104

Vulnerability Information
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Vulnerability Title
MapServer: NULL pointer dereference in SLD `<ElseFilter>` rule parsing reachable via WMS `SLD_BODY`
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Mapserver 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mapserver是开源地理空间（Osgeo）基金会的一套用于将空间数据和交互式地图应用程序发布到Web的开源平台。 MapServer 6.4.0版本至8.6.3之前版本存在代码问题漏洞，该漏洞源于msSLDParseUserStyle函数对带有ElseFilter的规则处理不当，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MapServer MapServer >= 6.4.0, < 8.6.3 -

II. Public POCs for CVE-2026-45104

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 4747 chars
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III. Intelligence Information for CVE-2026-45104

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Vendor Advisories for CVE-2026-45104 (1)

IV. Related Vulnerabilities

Same product: MapServer
Same vendor: MapServer
Same weakness: CWE-129

V. Comments for CVE-2026-45104

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