From ff300ac4aa546748b27415e7fd2527315435ef8e Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 1 Jun 2026 13:31:11 +0200
Subject: [PATCH] setopt: defref the old referer when setting a new

Closes #21826
---
 lib/setopt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/setopt.c b/lib/setopt.c
index e67a3c8beb..07fa60be7e 100644
--- a/lib/setopt.c
+++ b/lib/setopt.c
@@ -2024,6 +2024,7 @@ static CURLcode setopt_cptr(struct Curl_easy *data, CURLoption option,
     /*
      * String to set in the HTTP Referer: field.
      */
+    Curl_bufref_free(&data->state.referer);
     result = Curl_setstropt(&s->str[STRING_SET_REFERER], ptr);
     break;