diff --git a/packages/algoliasearch-helper/src/SearchParameters/index.js b/packages/algoliasearch-helper/src/SearchParameters/index.js
index 4ff71f34431..21d015bf6ea 100644
--- a/packages/algoliasearch-helper/src/SearchParameters/index.js
+++ b/packages/algoliasearch-helper/src/SearchParameters/index.js
@@ -225,6 +225,13 @@ function SearchParameters(newParameters) {
  */
 SearchParameters.PARAMETERS = Object.keys(new SearchParameters());
 
+// Returns a finite number or null. Used to reject Infinity/-Infinity from parseFloat.
+function parseFiniteFloat(value) {
+  var n = parseFloat(value);
+  // global isFinite is safe here: n is always a number type (no string coercion risk)
+  return isFinite(n) ? n : null;
+}
+
 /**
  * @private
  * @param {object} partialState full or part of a state
@@ -254,8 +261,18 @@ SearchParameters._parseNumbers = function (partialState) {
     var value = partialState[k];
     if (typeof value === 'string') {
       var parsedValue = parseFloat(value);
-      // global isNaN is ok to use here, value is only number or NaN
-      numbers[k] = isNaN(parsedValue) ? value : parsedValue;
+      if (isNaN(parsedValue)) {
+        // Unparseable string like "all" — keep original
+        numbers[k] = value;
+      } else if (!isFinite(parsedValue)) {
+        // Infinity/-Infinity — convert to null
+        numbers[k] = null;
+      } else {
+        numbers[k] = parsedValue;
+      }
+    } else if (typeof value === 'number' && !isFinite(value)) {
+      // Already-numeric Infinity — convert to null
+      numbers[k] = null;
     }
   });
 
@@ -267,7 +284,13 @@ SearchParameters._parseNumbers = function (partialState) {
     ) {
       if (Array.isArray(geoRect)) {
         return geoRect.map(function (value) {
-          return parseFloat(value);
+          if (typeof value === 'string') {
+            return parseFiniteFloat(value);
+          }
+          if (typeof value === 'number' && !isFinite(value)) {
+            return null;
+          }
+          return value;
         });
       }
       return geoRect;
@@ -285,12 +308,17 @@ SearchParameters._parseNumbers = function (partialState) {
           if (Array.isArray(v)) {
             return v.map(function (vPrime) {
               if (typeof vPrime === 'string') {
-                return parseFloat(vPrime);
+                return parseFiniteFloat(vPrime);
+              }
+              if (typeof vPrime === 'number' && !isFinite(vPrime)) {
+                return null;
               }
               return vPrime;
             });
           } else if (typeof v === 'string') {
-            return parseFloat(v);
+            return parseFiniteFloat(v);
+          } else if (typeof v === 'number' && !isFinite(v)) {
+            return null;
           }
           return v;
         });
diff --git a/packages/algoliasearch-helper/test/spec/SearchParameters/_parseNumbers.js b/packages/algoliasearch-helper/test/spec/SearchParameters/_parseNumbers.js
index 1f1227a61bf..187d349cef1 100644
--- a/packages/algoliasearch-helper/test/spec/SearchParameters/_parseNumbers.js
+++ b/packages/algoliasearch-helper/test/spec/SearchParameters/_parseNumbers.js
@@ -102,3 +102,95 @@ test('_parseNumbers should convert nested numericRefinements values', function (
   expect(actual.numericRefinements.foo['>=']).toEqual([[4.8], 15.16]);
   expect(actual.numericRefinements.foo['=']).toEqual([23.42]);
 });
+
+test('_parseNumbers should convert string "Infinity" to null for number keys', function () {
+  var partialState = {
+    page: 'Infinity',
+    hitsPerPage: '-Infinity',
+  };
+  var actual = SearchParameters._parseNumbers(partialState);
+
+  expect(actual.page).toBe(null);
+  expect(actual.hitsPerPage).toBe(null);
+});
+
+test('_parseNumbers should convert numeric Infinity to null for number keys', function () {
+  var partialState = {
+    page: Infinity,
+    hitsPerPage: -Infinity,
+  };
+  var actual = SearchParameters._parseNumbers(partialState);
+
+  expect(actual.page).toBe(null);
+  expect(actual.hitsPerPage).toBe(null);
+});
+
+test('_parseNumbers should convert "Infinity" to null while keeping "all" as string', function () {
+  var partialState = {
+    aroundRadius: 'all',
+    page: 'Infinity',
+  };
+  var actual = SearchParameters._parseNumbers(partialState);
+
+  expect(actual.aroundRadius).toBe('all');
+  expect(actual.page).toBe(null);
+});
+
+test('_parseNumbers should convert string "Infinity" to null in insideBoundingBox', function () {
+  var partialState = {
+    insideBoundingBox: [['Infinity', '9.66', '-Infinity', '-5.55']],
+  };
+  var actual = SearchParameters._parseNumbers(partialState);
+
+  expect(actual.insideBoundingBox).toEqual([[null, 9.66, null, -5.55]]);
+});
+
+test('_parseNumbers should convert numeric Infinity to null in insideBoundingBox', function () {
+  var partialState = {
+    insideBoundingBox: [[Infinity, 9.66, -Infinity, -5.55]],
+  };
+  var actual = SearchParameters._parseNumbers(partialState);
+
+  expect(actual.insideBoundingBox).toEqual([[null, 9.66, null, -5.55]]);
+});
+
+test('_parseNumbers should convert string "Infinity" to null in numericRefinements', function () {
+  var partialState = {
+    numericRefinements: {
+      price: {
+        '>=': ['Infinity', '-Infinity'],
+        '<=': [['Infinity']],
+      },
+    },
+  };
+  var actual = SearchParameters._parseNumbers(partialState);
+
+  expect(actual.numericRefinements.price['>=']).toEqual([null, null]);
+  expect(actual.numericRefinements.price['<=']).toEqual([[null]]);
+});
+
+test('_parseNumbers should convert numeric Infinity to null in numericRefinements', function () {
+  var partialState = {
+    numericRefinements: {
+      price: {
+        '>=': [Infinity, -Infinity],
+        '<=': [[Infinity]],
+      },
+    },
+  };
+  var actual = SearchParameters._parseNumbers(partialState);
+
+  expect(actual.numericRefinements.price['>=']).toEqual([null, null]);
+  expect(actual.numericRefinements.price['<=']).toEqual([[null]]);
+});
+
+test('_parseNumbers should convert numeric NaN to null for number keys', function () {
+  var partialState = {
+    page: NaN,
+    hitsPerPage: NaN,
+  };
+  var actual = SearchParameters._parseNumbers(partialState);
+
+  expect(actual.page).toBe(null);
+  expect(actual.hitsPerPage).toBe(null);
+});