🛡️ CVE-2026-45104
🟠 CVSS 7.5 — High ⚠️ Exploit Public CWE-129 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

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 carrying — 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.

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-129
Public Exploit ⚠️ Yes
Source NVD
Published 2026-05-27
Updated 2026-06-03
Modified 2026-06-02
Fix URL N/A

Affected Packages

Software From version Fixed in
mapserver 6.4.0 8.6.3
unknown — —

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