From e90b2aaa7e9dce64c3d7416b17a7c2feb7208db3 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Sun, 12 Oct 2025 11:38:39 +0200
Subject: [PATCH] tftp: error requests for blank filenames

Reported-by: Joshua Rogers
Closes #19033
---
 lib/tftp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/tftp.c b/lib/tftp.c
index 8279f29e65..0a9b8a8e87 100644
--- a/lib/tftp.c
+++ b/lib/tftp.c
@@ -460,6 +460,10 @@ static CURLcode tftp_send_first(struct tftp_conn *state,
     /* As RFC3617 describes the separator slash is not actually part of the
        filename so we skip the always-present first letter of the path
        string. */
+    if(!state->data->state.up.path[1]) {
+      failf(data, "Missing filename");
+      return CURLE_TFTP_ILLEGAL;
+    }
     result = Curl_urldecode(&state->data->state.up.path[1], 0,
                             &filename, NULL, REJECT_ZERO);
     if(result)
-- 
2.47.3