{"api_version":"1","generated_at":"2026-07-23T14:14:50+00:00","cve":"CVE-2021-39185","urls":{"html":"https://cve.report/CVE-2021-39185","api":"https://cve.report/api/cve/CVE-2021-39185.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-39185","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-39185"},"summary":{"title":"CVE-2021-39185","description":"Http4s is a minimal, idiomatic Scala interface for HTTP services. In http4s versions 0.21.26 and prior, 0.22.0 through 0.22.2, 0.23.0, 0.23.1, and 1.0.0-M1 through 1.0.0-M24, the default CORS configuration is vulnerable to an origin reflection attack. The middleware is also susceptible to a Null Origin Attack. The problem is fixed in 0.21.27, 0.22.3, 0.23.2, and 1.0.0-M25. The original `CORS` implementation and `CORSConfig` are deprecated. 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