Fix length check on dns_rfc1035_label tag

baked_in.go

@@ -2856,6 +2856,12 @@ func isCveFormat(fl FieldLevel) bool {
 // a valid dns RFC 1035 label, defined in RFC 1035.
 func isDnsRFC1035LabelFormat(fl FieldLevel) bool {
 	val := fl.Field().String()
+
+	size := len(val)
+	if size > 63 {
+		return false
+	}
+
 	return dnsRegexRFC1035Label.MatchString(val)
 }
 

regexes.go

@@ -65,7 +65,7 @@ const (
 	splitParamsRegexString           = `'[^']*'|\S+`
 	bicRegexString                   = `^[A-Za-z]{6}[A-Za-z0-9]{2}([A-Za-z0-9]{3})?$`
 	semverRegexString                = `^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$` // numbered capture groups https://semver.org/
-	dnsRegexStringRFC1035Label       = "^[a-z]([-a-z0-9]*[a-z0-9]){0,62}$"
+	dnsRegexStringRFC1035Label       = "^[a-z]([-a-z0-9]*[a-z0-9])?$"
 	cveRegexString                   = `^CVE-(1999|2\d{3})-(0[^0]\d{2}|0\d[^0]\d{1}|0\d{2}[^0]|[1-9]{1}\d{3,})$` // CVE Format Id https://cve.mitre.org/cve/identifiers/syntaxchange.html
 	mongodbRegexString               = "^[a-f\\d]{24}$"
 	cronRegexString                  = `(@(annually|yearly|monthly|weekly|daily|hourly|reboot))|(@every (\d+(ns|us|µs|ms|s|m|h))+)|((((\d+,)+\d+|(\d+(\/|-)\d+)|\d+|\*) ?){5,7})`

validator_test.go

@@ -12967,6 +12967,8 @@ func TestRFC1035LabelFormatValidation(t *testing.T) {
 		{"ABC-ABC", "dns_rfc1035_label", false},
 		{"123-abc", "dns_rfc1035_label", false},
 		{"", "dns_rfc1035_label", false},
+		{"abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijk", "dns_rfc1035_label", true},
+		{"abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkl", "dns_rfc1035_label", false},
 	}
 
 	validate := New()