{"schema_version":"1.3.1","id":"GO-2025-4175","modified":"2025-12-02T20:55:55Z","published":"2025-12-02T20:55:55Z","aliases":["CVE-2025-61727"],"summary":"Improper application of excluded DNS name constraints when verifying wildcard names in crypto/x509","details":"An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certificate. For example a constraint that excludes the subdomain test.example.com does not prevent a leaf certificate from claiming the SAN *.example.com.","affected":[{"package":{"name":"stdlib","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.24.11"},{"introduced":"1.25.0"},{"fixed":"1.25.5"}]}],"ecosystem_specific":{"imports":[{"path":"crypto/x509","symbols":["Certificate.Verify"]}]}}],"references":[{"type":"FIX","url":"https://go.dev/cl/723900"},{"type":"REPORT","url":"https://go.dev/issue/76442"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/8FJoBkPddm4"}],"database_specific":{"url":"https://pkg.go.dev/vuln/GO-2025-4175","review_status":"REVIEWED"}}