diff --git a/.changeset/dry-candles-lie.md b/.changeset/dry-candles-lie.md
new file mode 100644
index 0000000000..a3b0d441c9
--- /dev/null
+++ b/.changeset/dry-candles-lie.md
@@ -0,0 +1,5 @@
+---
+"@redocly/openapi-core": patch
+---
+
+Resolved an issue where overrides for the severity of configurable rules raised warnings when validating the config.
diff --git a/packages/core/src/types/redocly-yaml.ts b/packages/core/src/types/redocly-yaml.ts
index 4735fc55a5..46a74aa8ad 100644
--- a/packages/core/src/types/redocly-yaml.ts
+++ b/packages/core/src/types/redocly-yaml.ts
@@ -392,10 +392,18 @@ const Rules: NodeType = {
   properties: {},
   additionalProperties: (value: unknown, key: string) => {
     if (key.startsWith('rule/')) {
-      return 'Assert';
+      if (typeof value === 'string') {
+        return { enum: ['error', 'warn', 'off'] };
+      } else {
+        return 'Assert';
+      }
     } else if (key.startsWith('assert/')) {
       // keep the old assert/ prefix as an alias
-      return 'Assert';
+      if (typeof value === 'string') {
+        return { enum: ['error', 'warn', 'off'] };
+      } else {
+        return 'Assert';
+      }
     } else if (builtInRules.includes(key as BuiltInRuleId) || isCustomRuleId(key)) {
       if (typeof value === 'string') {
         return { enum: ['error', 'warn', 'off'] };