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High severity7.5NVD Advisory· Published May 27, 2026· Updated Jun 2, 2026

CVE-2026-45104

CVE-2026-45104

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.

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Affected products

2
  • MapServer/Mapserverinferred2 versions
    >=6.4.0,<8.6.3+ 1 more
    • (no CPE)range: >=6.4.0,<8.6.3
    • (no CPE)range: <8.6.3

Patches

Vulnerability mechanics

References

1

News mentions

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