From 32531f20f9f8f76e351ae317ad47b97bef82acc0 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Sun, 15 Mar 2026 17:04:47 +0100
Subject: [PATCH] doh: fix memory-leak when doing a second DoH resolve

Reported-by: James Fuller
Closes #20929
---
 lib/doh.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/doh.c b/lib/doh.c
index 9b1d93e929..7374006a35 100644
--- a/lib/doh.c
+++ b/lib/doh.c
@@ -448,6 +448,7 @@ CURLcode Curl_doh(struct Curl_easy *data, const char *hostname,
   data->state.async.done = FALSE;
   data->state.async.port = port;
   data->state.async.ip_version = ip_version;
+  curlx_free(data->state.async.hostname);
   data->state.async.hostname = curlx_strdup(hostname);
   if(!data->state.async.hostname)
     return CURLE_OUT_OF_MEMORY;