diff --git a/eslint-suppressions.json b/eslint-suppressions.json
index e1ad67225a3..dd762bd60c5 100644
--- a/eslint-suppressions.json
+++ b/eslint-suppressions.json
@@ -127,6 +127,11 @@
       "count": 6
     }
   },
+  "packages/assets-controller/src/__fixtures__/MockAssetControllerMessenger.ts": {
+    "import-x/no-relative-packages": {
+      "count": 1
+    }
+  },
   "packages/assets-controllers/jest.environment.js": {
     "n/prefer-global/text-decoder": {
       "count": 1
@@ -251,6 +256,9 @@
     "id-length": {
       "count": 1
     },
+    "import-x/no-relative-packages": {
+      "count": 1
+    },
     "no-negated-condition": {
       "count": 1
     },
@@ -258,6 +266,11 @@
       "count": 2
     }
   },
+  "packages/assets-controllers/src/NftDetectionController.ts": {
+    "import-x/no-relative-packages": {
+      "count": 1
+    }
+  },
   "packages/assets-controllers/src/RatesController/RatesController.test.ts": {
     "@typescript-eslint/explicit-function-return-type": {
       "count": 1
@@ -614,6 +627,9 @@
   "packages/bridge-status-controller/src/utils/transaction.ts": {
     "@typescript-eslint/prefer-nullish-coalescing": {
       "count": 1
+    },
+    "import-x/no-relative-packages": {
+      "count": 1
     }
   },
   "packages/chain-agnostic-permission/src/caip25Permission.ts": {
@@ -1689,6 +1705,16 @@
       "count": 2
     }
   },
+  "packages/transaction-pay-controller/src/strategy/relay/relay-quotes.ts": {
+    "import-x/no-relative-packages": {
+      "count": 1
+    }
+  },
+  "packages/transaction-pay-controller/src/utils/source-amounts.ts": {
+    "import-x/no-relative-packages": {
+      "count": 1
+    }
+  },
   "packages/user-operation-controller/src/UserOperationController.test.ts": {
     "@typescript-eslint/explicit-function-return-type": {
       "count": 6
diff --git a/eslint.config.mjs b/eslint.config.mjs
index a124c6f9948..76bbdf4f3d4 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -144,6 +144,14 @@ const config = createConfig([
       sourceType: 'module',
     },
   },
+  // Prevent cross-package relative imports
+  {
+    files: ['packages/*/src/**/*.ts'],
+    ignores: ['**/*.test.ts', '**/tests/**/*.ts'],
+    rules: {
+      'import-x/no-relative-packages': 'error',
+    },
+  },
   {
     files: ['packages/foundryup/**/*.{js,ts}'],
     rules: {