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Mapserver 5.2, 5.4 and 5.6 before 5.6.5-2 improperly validates symbol index values during Mapfile parsing.
Use CWE-20, Osgeo vendor hub and Mapserver product page to widen CVE-2010-1678 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2010-2540, CVE-2017-5522 and CVE-2025-59431 for nearby disclosures in the same product family.