From c6ff6d268baba89bc24268d0b7e8172d62cee23f Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Wed, 14 Jan 2026 17:35:36 -1000
Subject: [PATCH] safer

---
 esphome/core/helpers.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/esphome/core/helpers.cpp b/esphome/core/helpers.cpp
index 7f70a0126e..85fe7e3d89 100644
--- a/esphome/core/helpers.cpp
+++ b/esphome/core/helpers.cpp
@@ -410,6 +410,10 @@ char *format_bin_to(char *buffer, size_t buffer_size, const uint8_t *data, size_
   }
   // Calculate max bytes we can format: each byte needs 8 chars
   size_t max_bytes = (buffer_size - 1) / 8;
+  if (max_bytes == 0 || length == 0) {
+    buffer[0] = '\0';
+    return buffer;
+  }
   size_t bytes_to_format = std::min(length, max_bytes);
 
   for (size_t byte_idx = 0; byte_idx < bytes_to_format; byte_idx++) {