diff --git a/package.json b/package.json
index 332ef3b6e5c..54cb2ea89ac 100644
--- a/package.json
+++ b/package.json
@@ -90,7 +90,6 @@
     "intl-messageformat": "7.8.4",
     "ip": "^2.0.1",
     "ipaddr.js": "2.2.0",
-    "is-base64": "^1.1.0",
     "is-url": "1.2.4",
     "jexl": "2.2.2",
     "jquery": "3.5.1",
diff --git a/pkg/harvester-manager/machine-config/harvester.vue b/pkg/harvester-manager/machine-config/harvester.vue
index 3704180bc4e..10a389340ba 100644
--- a/pkg/harvester-manager/machine-config/harvester.vue
+++ b/pkg/harvester-manager/machine-config/harvester.vue
@@ -3,7 +3,7 @@ import draggable from 'vuedraggable';
 import isEmpty from 'lodash/isEmpty';
 import jsyaml from 'js-yaml';
 import YAML from 'yaml';
-import isBase64 from 'is-base64';
+import { isBase64 } from '@shell/utils/string';
 
 import NodeAffinity from '@shell/components/form/NodeAffinity';
 import PodAffinity from '@shell/components/form/PodAffinity';
diff --git a/shell/edit/provisioning.cattle.io.cluster/tabs/registries/RegistryConfigs.vue b/shell/edit/provisioning.cattle.io.cluster/tabs/registries/RegistryConfigs.vue
index f83c07ce077..fbb77e6d642 100644
--- a/shell/edit/provisioning.cattle.io.cluster/tabs/registries/RegistryConfigs.vue
+++ b/shell/edit/provisioning.cattle.io.cluster/tabs/registries/RegistryConfigs.vue
@@ -1,12 +1,14 @@
 <script>
+import { clone, set } from '@shell/utils/object';
 import ArrayListGrouped from '@shell/components/form/ArrayListGrouped';
-import { set } from '@shell/utils/object';
+
 import { LabeledInput } from '@components/Form/LabeledInput';
 import { Checkbox } from '@components/Form/Checkbox';
 import SelectOrCreateAuthSecret from '@shell/components/form/SelectOrCreateAuthSecret';
 import CreateEditView from '@shell/mixins/create-edit-view';
 import SecretSelector from '@shell/components/form/SecretSelector';
 import { SECRET_TYPES as TYPES } from '@shell/config/secret';
+import { isBase64 } from '@shell/utils/string';
 import { base64Decode, base64Encode } from '@shell/utils/crypto';
 
 export default {
@@ -41,7 +43,7 @@ export default {
   },
 
   data() {
-    const configMap = this.value.spec.rkeConfig?.registries?.configs || {};
+    const configMap = clone(this.value.spec.rkeConfig?.registries?.configs) || {};
     const entries = [];
 
     const defaultAddValue = {
@@ -56,7 +58,11 @@ export default {
       if (configMap[hostname]) {
         configMap[hostname].insecureSkipVerify = configMap[hostname].insecureSkipVerify ?? defaultAddValue.insecureSkipVerify;
         configMap[hostname].authConfigSecretName = configMap[hostname].authConfigSecretName ?? defaultAddValue.authConfigSecretName;
-        configMap[hostname].caBundle = base64Decode(configMap[hostname].caBundle ?? defaultAddValue.caBundle);
+
+        const caBundle = configMap[hostname].caBundle ?? defaultAddValue.caBundle;
+
+        configMap[hostname].caBundle = isBase64(caBundle) ? base64Decode(caBundle) : caBundle;
+
         configMap[hostname].tlsSecretName = configMap[hostname].tlsSecretName ?? defaultAddValue.tlsSecretName;
       }
       entries.push({
diff --git a/shell/edit/provisioning.cattle.io.cluster/tabs/registries/__tests__/RegistryConfigs.test.ts b/shell/edit/provisioning.cattle.io.cluster/tabs/registries/__tests__/RegistryConfigs.test.ts
index e9cabf7f472..0dee238f428 100644
--- a/shell/edit/provisioning.cattle.io.cluster/tabs/registries/__tests__/RegistryConfigs.test.ts
+++ b/shell/edit/provisioning.cattle.io.cluster/tabs/registries/__tests__/RegistryConfigs.test.ts
@@ -21,10 +21,13 @@ describe('component: RegistryConfigs', () => {
   };
 
   describe('key CA Cert Bundle', () => {
-    it('should display default key', () => {
+    it.each([
+      ['source is plain text', 'Zm9vYmFy', 'foobar'],
+      ['source is base64', 'foobar', 'foobar'],
+    ])('should display key, %p', (_, sourceCaBundle, displayedCaBundle) => {
       const value = clone(PROV_CLUSTER);
 
-      value.spec.rkeConfig.registries.configs = { foo: { caBundle: 'Zm9vYmFy' } };
+      value.spec.rkeConfig.registries.configs = { foo: { caBundle: sourceCaBundle } };
 
       mountOptions.propsData.value = value;
 
@@ -35,7 +38,7 @@ describe('component: RegistryConfigs', () => {
 
       const registry = wrapper.find('[data-testid^="registry-caBundle"]').element as HTMLTextAreaElement;
 
-      expect(registry.value).toBe('foobar');
+      expect(registry.value).toBe(displayedCaBundle);
     });
 
     it('should update key in base64 format', async() => {
diff --git a/shell/utils/string.js b/shell/utils/string.js
index 898ec790693..ac8d6f4892f 100644
--- a/shell/utils/string.js
+++ b/shell/utils/string.js
@@ -330,3 +330,9 @@ export function sanitizeIP(v) {
 export function xOfy(x, y) {
   return `${ typeof x === 'number' ? x : '?' }/${ typeof y === 'number' ? y : '?' }`;
 }
+
+export function isBase64(value) {
+  const base64regex = /^([0-9a-zA-Z+/]{4})*(([0-9a-zA-Z+/]{2}==)|([0-9a-zA-Z+/]{3}=))?$/;
+
+  return base64regex.test(value);
+}
diff --git a/yarn.lock b/yarn.lock
index 176e9dcbfce..0e1c6e86561 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -10187,11 +10187,6 @@ is-arrayish@^0.3.1:
   resolved "https://registry.yarnpkg.com/is-arrayish/-/is-arrayish-0.3.2.tgz#4574a2ae56f7ab206896fb431eaeed066fdf8f03"
   integrity sha512-eVRqCvVlZbuw3GrM63ovNSNAeA1K16kaR/LRY/92w0zxQ5/1YzwblUX652i4Xs9RwAGjW9d9y6X88t8OaAJfWQ==
 
-is-base64@^1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/is-base64/-/is-base64-1.1.0.tgz#8ce1d719895030a457c59a7dcaf39b66d99d56b4"
-  integrity sha512-Nlhg7Z2dVC4/PTvIFkgVVNvPHSO2eR/Yd0XzhGiXCXEvWnptXlXa/clQ8aePPiMuxEGcWfzWbGw2Fe3d+Y3v1g==
-
 is-bigint@^1.0.1:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/is-bigint/-/is-bigint-1.0.4.tgz#08147a1875bc2b32005d41ccd8291dffc6691df3"