parseWildcardRules in Gin-Gonic CORS middleware before 1.6.0 mishandles a wildcard at the end of an origin string, e.g., https://example.community/* is allowed when the intention is that only https://example.com/* should be allowed, and http://localhost.example.com/* is allowed when the intention is that only http://localhost/* should be allowed.

References

• https://nvd.nist.gov/vuln/detail/CVE-2019-25211
• gin-contrib/cors#106
• gin-contrib/cors#57
• gin-contrib/cors@27b723a
• gin-contrib/cors@v1.5.0...v1.6.0
• https://github.com/gin-contrib/cors/releases/tag/v1.6.0