diff --git a/esphome/components/rc522/rc522.cpp b/esphome/components/rc522/rc522.cpp
index 8f8740c925..470c50109e 100644
--- a/esphome/components/rc522/rc522.cpp
+++ b/esphome/components/rc522/rc522.cpp
@@ -492,7 +492,10 @@ bool RC522BinarySensor::process(std::vector<uint8_t> &data) {
   this->found_ = result;
   return result;
 }
-void RC522Trigger::process(std::vector<uint8_t> &data) { this->trigger(format_hex_pretty(data, '-', false)); }
+void RC522Trigger::process(std::vector<uint8_t> &data) {
+  char uid_buf[format_hex_pretty_size(RC522_MAX_UID_SIZE)];
+  this->trigger(format_hex_pretty_to(uid_buf, data.data(), data.size(), '-'));
+}
 
 }  // namespace rc522
 }  // namespace esphome
diff --git a/esphome/components/remote_base/midea_protocol.h b/esphome/components/remote_base/midea_protocol.h
index 0a5de8e9df..c3030d565e 100644
--- a/esphome/components/remote_base/midea_protocol.h
+++ b/esphome/components/remote_base/midea_protocol.h
@@ -29,6 +29,8 @@ class MideaData {
   bool is_valid() const { return this->data_[OFFSET_CS] == this->calc_cs_(); }
   void finalize() { this->data_[OFFSET_CS] = this->calc_cs_(); }
   bool is_compliment(const MideaData &rhs) const;
+  /// @deprecated Allocates heap memory. Use to_str() instead. Removed in 2026.7.0.
+  ESPDEPRECATED("Allocates heap memory. Use to_str() instead. Removed in 2026.7.0.", "2026.1.0")
   std::string to_string() const { return format_hex_pretty(this->data_.data(), this->data_.size()); }
   /// Buffer size for to_str(): 6 bytes = "AA.BB.CC.DD.EE.FF\0"
   static constexpr size_t TO_STR_BUFFER_SIZE = format_hex_pretty_size(6);
diff --git a/esphome/components/tuya/text_sensor/tuya_text_sensor.cpp b/esphome/components/tuya/text_sensor/tuya_text_sensor.cpp
index 3c492d609d..36b6d630ae 100644
--- a/esphome/components/tuya/text_sensor/tuya_text_sensor.cpp
+++ b/esphome/components/tuya/text_sensor/tuya_text_sensor.cpp
@@ -1,4 +1,5 @@
 #include "tuya_text_sensor.h"
+#include "esphome/core/entity_base.h"
 #include "esphome/core/log.h"
 
 namespace esphome {
@@ -14,9 +15,11 @@ void TuyaTextSensor::setup() {
         this->publish_state(datapoint.value_string);
         break;
       case TuyaDatapointType::RAW: {
-        std::string data = format_hex_pretty(datapoint.value_raw);
-        ESP_LOGD(TAG, "MCU reported text sensor %u is: %s", datapoint.id, data.c_str());
-        this->publish_state(data);
+        char hex_buf[MAX_STATE_LEN + 1];
+        const char *formatted =
+            format_hex_pretty_to(hex_buf, sizeof(hex_buf), datapoint.value_raw.data(), datapoint.value_raw.size());
+        ESP_LOGD(TAG, "MCU reported text sensor %u is: %s", datapoint.id, formatted);
+        this->publish_state(formatted);
         break;
       }
       case TuyaDatapointType::ENUM: {
diff --git a/esphome/core/entity_base.h b/esphome/core/entity_base.h
index 5f75872a0f..f91bd9b20c 100644
--- a/esphome/core/entity_base.h
+++ b/esphome/core/entity_base.h
@@ -26,6 +26,9 @@ static constexpr size_t ESPHOME_DOMAIN_MAX_LEN = 20;
 // Maximum size for object_id buffer (friendly_name + null + margin)
 static constexpr size_t OBJECT_ID_MAX_LEN = 128;
 
+// Maximum state length that Home Assistant will accept without raising ValueError
+static constexpr size_t MAX_STATE_LEN = 255;
+
 enum EntityCategory : uint8_t {
   ENTITY_CATEGORY_NONE = 0,
   ENTITY_CATEGORY_CONFIG = 1,