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In WinRAR versions prior to and including 5.61, There is path traversal vulnerability when crafting the filename field of the ACE format (in UNACEV2.dll). When the filename field is manipulated with specific patterns, the destination (extraction) folder is ignored, thus treating the filename as an absolute path.
Use CWE-36, Rarlab vendor hub and Winrar product page to widen CVE-2018-20250 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2025-8088, CVE-2025-6218 and CVE-2023-38831 for nearby disclosures in the same product family.