diff --git a/NEWS b/NEWS
index b1f7dbf8e30..1f2eea02530 100644
--- a/NEWS
+++ b/NEWS
@@ -12,6 +12,9 @@ PHP                                                                        NEWS
   . Fixed bug GH-17913 (ReflectionFunction::isDeprecated() returns incorrect
     results for closures created from magic __call()). (timwolla)
 
+- Standard:
+  . Fix memory leaks in array_any() / array_all(). (nielsdos)
+
 - Treewide:
   . Fixed bug GH-17736 (Assertion failure zend_reference_destroy()). (nielsdos)
 
diff --git a/ext/standard/array.c b/ext/standard/array.c
index 6bfc0dc9c04..0c2de2a98a1 100644
--- a/ext/standard/array.c
+++ b/ext/standard/array.c
@@ -6628,7 +6628,8 @@ static zend_result php_array_find(const HashTable *array, zend_fcall_info fci, z
 		ZVAL_COPY(&args[0], operand);
 
 		zend_result result = zend_call_function(&fci, &fci_cache);
-		if (EXPECTED(result == SUCCESS)) {
+		ZEND_ASSERT(result == SUCCESS);
+		if (EXPECTED(!Z_ISUNDEF(retval))) {
 			int retval_true;
 
 			retval_true = zend_is_true(&retval);
@@ -6656,7 +6657,7 @@ static zend_result php_array_find(const HashTable *array, zend_fcall_info fci, z
 		zval_ptr_dtor(&args[0]);
 		zval_ptr_dtor(&args[1]);
 
-		if (UNEXPECTED(result != SUCCESS)) {
+		if (UNEXPECTED(Z_ISUNDEF(retval))) {
 			return FAILURE;
 		}
 	} ZEND_HASH_FOREACH_END();
@@ -6725,7 +6726,11 @@ PHP_FUNCTION(array_any)
 		RETURN_THROWS();
 	}
 
-	RETURN_BOOL(Z_TYPE_P(return_value) != IS_UNDEF);
+	bool retval = !Z_ISUNDEF_P(return_value);
+	if (Z_TYPE_P(return_value) == IS_STRING) {
+		zval_ptr_dtor_str(return_value);
+	}
+	RETURN_BOOL(retval);
 }
 /* }}} */
 
@@ -6745,7 +6750,11 @@ PHP_FUNCTION(array_all)
 		RETURN_THROWS();
 	}
 
-	RETURN_BOOL(Z_TYPE_P(return_value) == IS_UNDEF);
+	bool retval = Z_ISUNDEF_P(return_value);
+	if (Z_TYPE_P(return_value) == IS_STRING) {
+		zval_ptr_dtor_str(return_value);
+	}
+	RETURN_BOOL(retval);
 }
 /* }}} */
 
diff --git a/ext/standard/tests/array/gh17977.phpt b/ext/standard/tests/array/gh17977.phpt
new file mode 100644
index 00000000000..4a4f344dc47
--- /dev/null
+++ b/ext/standard/tests/array/gh17977.phpt
@@ -0,0 +1,18 @@
+--TEST--
+array_any() / array_all() leak
+--DESCRIPTION--
+Found in GH-16831#issuecomment-2700410631
+--FILE--
+<?php
+
+// Don't touch this str_repeat + random_int combination,
+// this is to circumvent SCCP and interning
+$key = str_repeat('abc', random_int(3, 3));
+
+var_dump(array_any([$key => 1], static fn () => true));
+var_dump(array_all([$key => 1], static fn () => false));
+
+?>
+--EXPECT--
+bool(true)
+bool(false)