From 8e6bc37785ea8f7d01fecca86299a9077bd6b378 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Thu, 19 Mar 2026 13:41:04 -1000
Subject: [PATCH] Ensure non-zero seed after random_bytes()

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

diff --git a/esphome/core/helpers.cpp b/esphome/core/helpers.cpp
index 1b6f8caf717..ee99c541963 100644
--- a/esphome/core/helpers.cpp
+++ b/esphome/core/helpers.cpp
@@ -172,6 +172,7 @@ uint32_t random_uint32() {
   // a separate bool flag (4 bytes BSS + branch on every call).
   if (splitmix32_state == 0) {
     random_bytes(reinterpret_cast<uint8_t *>(&splitmix32_state), sizeof(splitmix32_state));
+    splitmix32_state |= 1;  // ensure non-zero seed
   }
   splitmix32_state += 0x9e3779b9u;
   uint32_t z = splitmix32_state;