From 74218bc74271b4b282514b1fae1b8547cdbaef6b Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Wed, 10 Dec 2025 19:33:22 -0600
Subject: [PATCH] [api] Release prologue memory after noise handshake completes
 (#12412)

---
 esphome/components/api/api_frame_helper_noise.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/esphome/components/api/api_frame_helper_noise.cpp b/esphome/components/api/api_frame_helper_noise.cpp
index ae69f0b67..1d6f32ee9 100644
--- a/esphome/components/api/api_frame_helper_noise.cpp
+++ b/esphome/components/api/api_frame_helper_noise.cpp
@@ -539,7 +539,8 @@ APIError APINoiseFrameHelper::init_handshake_() {
   if (aerr != APIError::OK)
     return aerr;
   // set_prologue copies it into handshakestate, so we can get rid of it now
-  prologue_ = {};
+  // Use swap idiom to actually release memory (= {} only clears size, not capacity)
+  std::vector<uint8_t>().swap(prologue_);
 
   err = noise_handshakestate_start(handshake_);
   aerr = handle_noise_error_(err, LOG_STR("noise_handshakestate_start"), APIError::HANDSHAKESTATE_SETUP_FAILED);