From 87f5778434c5b5b774cb2c68d1bd09520061d554 Mon Sep 17 00:00:00 2001
From: Christopher Kohlhoff <chris@kohlhoff.com>
Date: Tue, 4 Nov 2025 23:43:08 +1100
Subject: [PATCH] Fix memory leak in ssl::detail::engine move assignment.

---
 include/boost/asio/ssl/detail/impl/engine.ipp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/boost/asio/ssl/detail/impl/engine.ipp b/include/boost/asio/ssl/detail/impl/engine.ipp
index 57933108..71a91f9e 100644
--- a/include/boost/asio/ssl/detail/impl/engine.ipp
+++ b/include/boost/asio/ssl/detail/impl/engine.ipp
@@ -101,6 +101,12 @@ engine& engine::operator=(engine&& other) noexcept
 {
   if (this != &other)
   {
+    if (ssl_ && SSL_get_app_data(ssl_))
+    {
+      delete static_cast<verify_callback_base*>(SSL_get_app_data(ssl_));
+      SSL_set_app_data(ssl_, 0);
+    }
+
     if (ext_bio_)
       ::BIO_free(ext_bio_);