[Medium] Patch curl for CVE-2026-6253, CVE-2026-6429, CVE-2026-5545 (microsoft#17441)

Author: jykanase

SPECS/curl/CVE-2026-5545.patch

@@ -0,0 +1,42 @@
+From 33e43985b8f3b9e66691d06e70be0395849856cd Mon Sep 17 00:00:00 2001
+From: Stefan Eissing <stefan@eissing.org>
+Date: Thu, 2 Apr 2026 11:33:39 +0200
+Subject: [PATCH] url: improve connection reuse on negotiate
+
+Check state of negotiate to allow proper connection reuse.
+
+Closes #21203
+Upstream Patch Reference: https://github.com/curl/curl/commit/33e43985b8f3b9e66691d06e70be0395849856cd.patch
+https://launchpadlibrarian.net/859770351/curl_8.14.1-2ubuntu1.2_8.14.1-2ubuntu1.3.diff.gz
+---
+ lib/url.c | 12 +++++++++---
+ 1 file changed, 9 insertions(+), 3 deletions(-)
+
+diff --git a/lib/url.c b/lib/url.c
+index 6ea7b30..984b8db 100644
+--- a/lib/url.c
++++ b/lib/url.c
+@@ -1166,11 +1166,17 @@ static bool url_match_conn(struct connectdata *conn, void *userdata)
+   if(match->want_ntlm_http) {
+     if(Curl_timestrcmp(needle->user, conn->user) ||
+        Curl_timestrcmp(needle->passwd, conn->passwd)) {
+-
+       /* we prefer a credential match, but this is at least a connection
+-         that can be reused and "upgraded" to NTLM */
+-      if(conn->http_ntlm_state == NTLMSTATE_NONE)
++         that can be reused and "upgraded" to NTLM if it does
++         not have any auth ongoing. */
++#ifdef USE_SPNEGO
++      if((conn->http_ntlm_state == NTLMSTATE_NONE)
++         && (conn->http_negotiate_state == GSS_AUTHNONE)) {
++#else
++      if(conn->http_ntlm_state == NTLMSTATE_NONE) {
++#endif
+         match->found = conn;
++      }
+       return FALSE;
+     }
+   }
+-- 
+2.45.4
+