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GDAL through 3.0.1 has a poolDestroy double free in OGRExpatRealloc in ogr/ogr_expat.cpp when the 10MB threshold is exceeded.
Use CWE-415, Osgeo vendor hub and Gdal product page to widen CVE-2019-17545 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2019-17546, CVE-2019-25050 and CVE-2025-29480 for nearby disclosures in the same product family.