diff --git a/esphome/components/wifi/wifi_component.cpp b/esphome/components/wifi/wifi_component.cpp
index 001d5f254a..a0a7d3d946 100644
--- a/esphome/components/wifi/wifi_component.cpp
+++ b/esphome/components/wifi/wifi_component.cpp
@@ -655,12 +655,15 @@ void WiFiComponent::setup_ap_config_() {
 #ifdef USE_WIFI_MANUAL_IP
   auto manual_ip = this->ap_.get_manual_ip();
   if (manual_ip.has_value()) {
+    char static_ip_buf[network::IP_ADDRESS_BUFFER_SIZE];
+    char gateway_buf[network::IP_ADDRESS_BUFFER_SIZE];
+    char subnet_buf[network::IP_ADDRESS_BUFFER_SIZE];
     ESP_LOGCONFIG(TAG,
                   "  AP Static IP: '%s'\n"
                   "  AP Gateway: '%s'\n"
                   "  AP Subnet: '%s'",
-                  manual_ip->static_ip.str().c_str(), manual_ip->gateway.str().c_str(),
-                  manual_ip->subnet.str().c_str());
+                  manual_ip->static_ip.str_to(static_ip_buf), manual_ip->gateway.str_to(gateway_buf),
+                  manual_ip->subnet.str_to(subnet_buf));
   }
 #endif
 
@@ -816,8 +819,14 @@ void WiFiComponent::start_connecting(const WiFiAP &ap) {
 #ifdef USE_WIFI_MANUAL_IP
   if (ap.get_manual_ip().has_value()) {
     ManualIP m = *ap.get_manual_ip();
-    ESP_LOGV(TAG, "  Manual IP: Static IP=%s Gateway=%s Subnet=%s DNS1=%s DNS2=%s", m.static_ip.str().c_str(),
-             m.gateway.str().c_str(), m.subnet.str().c_str(), m.dns1.str().c_str(), m.dns2.str().c_str());
+    char static_ip_buf[network::IP_ADDRESS_BUFFER_SIZE];
+    char gateway_buf[network::IP_ADDRESS_BUFFER_SIZE];
+    char subnet_buf[network::IP_ADDRESS_BUFFER_SIZE];
+    char dns1_buf[network::IP_ADDRESS_BUFFER_SIZE];
+    char dns2_buf[network::IP_ADDRESS_BUFFER_SIZE];
+    ESP_LOGV(TAG, "  Manual IP: Static IP=%s Gateway=%s Subnet=%s DNS1=%s DNS2=%s", m.static_ip.str_to(static_ip_buf),
+             m.gateway.str_to(gateway_buf), m.subnet.str_to(subnet_buf), m.dns1.str_to(dns1_buf),
+             m.dns2.str_to(dns2_buf));
   } else
 #endif
   {
diff --git a/esphome/components/wifi/wifi_component_esp8266.cpp b/esphome/components/wifi/wifi_component_esp8266.cpp
index 1c744648bb..86c8a8891b 100644
--- a/esphome/components/wifi/wifi_component_esp8266.cpp
+++ b/esphome/components/wifi/wifi_component_esp8266.cpp
@@ -810,10 +810,13 @@ bool WiFiComponent::wifi_ap_ip_config_(const optional<ManualIP> &manual_ip) {
   network::IPAddress start_address = network::IPAddress(&info.ip);
   start_address += 99;
   lease.start_ip = start_address;
-  ESP_LOGV(TAG, "DHCP server IP lease start: %s", start_address.str().c_str());
+#if ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_VERBOSE
+  char ip_buf[network::IP_ADDRESS_BUFFER_SIZE];
+#endif
+  ESP_LOGV(TAG, "DHCP server IP lease start: %s", start_address.str_to(ip_buf));
   start_address += 10;
   lease.end_ip = start_address;
-  ESP_LOGV(TAG, "DHCP server IP lease end: %s", start_address.str().c_str());
+  ESP_LOGV(TAG, "DHCP server IP lease end: %s", start_address.str_to(ip_buf));
   if (!wifi_softap_set_dhcps_lease(&lease)) {
     ESP_LOGE(TAG, "Set SoftAP DHCP lease failed");
     return false;
diff --git a/esphome/components/wifi/wifi_component_esp_idf.cpp b/esphome/components/wifi/wifi_component_esp_idf.cpp
index 5d4d003d62..d9b5e7c114 100644
--- a/esphome/components/wifi/wifi_component_esp_idf.cpp
+++ b/esphome/components/wifi/wifi_component_esp_idf.cpp
@@ -969,10 +969,13 @@ bool WiFiComponent::wifi_ap_ip_config_(const optional<ManualIP> &manual_ip) {
   network::IPAddress start_address = network::IPAddress(&info.ip);
   start_address += 99;
   lease.start_ip = start_address;
-  ESP_LOGV(TAG, "DHCP server IP lease start: %s", start_address.str().c_str());
+#if ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_VERBOSE
+  char ip_buf[network::IP_ADDRESS_BUFFER_SIZE];
+#endif
+  ESP_LOGV(TAG, "DHCP server IP lease start: %s", start_address.str_to(ip_buf));
   start_address += 10;
   lease.end_ip = start_address;
-  ESP_LOGV(TAG, "DHCP server IP lease end: %s", start_address.str().c_str());
+  ESP_LOGV(TAG, "DHCP server IP lease end: %s", start_address.str_to(ip_buf));
   err = esp_netif_dhcps_option(s_ap_netif, ESP_NETIF_OP_SET, ESP_NETIF_REQUESTED_IP_ADDRESS, &lease, sizeof(lease));
 
   if (err != ESP_OK) {
@@ -984,8 +987,10 @@ bool WiFiComponent::wifi_ap_ip_config_(const optional<ManualIP> &manual_ip) {
   // Configure DHCP Option 114 (Captive Portal URI) if captive portal is enabled
   // This provides a standards-compliant way for clients to discover the captive portal
   if (captive_portal::global_captive_portal != nullptr) {
-    static char captive_portal_uri[32];
-    snprintf(captive_portal_uri, sizeof(captive_portal_uri), "http://%s", network::IPAddress(&info.ip).str().c_str());
+    // Buffer must be static - dhcps_set_option_info stores pointer, doesn't copy
+    static char captive_portal_uri[24];        // "http://" (7) + IPv4 max (15) + null
+    memcpy(captive_portal_uri, "http://", 7);  // NOLINT(bugprone-not-null-terminated-result) - str_to null-terminates
+    network::IPAddress(&info.ip).str_to(captive_portal_uri + 7);
     err = esp_netif_dhcps_option(s_ap_netif, ESP_NETIF_OP_SET, ESP_NETIF_CAPTIVEPORTAL_URI, captive_portal_uri,
                                  strlen(captive_portal_uri));
     if (err != ESP_OK) {