diff --git a/meta/recipes-support/curl/curl/CVE-2026-4873.patch b/meta/recipes-support/curl/curl/CVE-2026-4873.patch
new file mode 100644
index 0000000000..b288de9306
--- /dev/null
+++ b/meta/recipes-support/curl/curl/CVE-2026-4873.patch
@@ -0,0 +1,52 @@
+From 4d13e431d26c3097e6dff49ba069061b588461af Mon Sep 17 00:00:00 2001
+From: Daniel Stenberg <daniel@haxx.se>
+Date: Tue, 24 Mar 2026 08:35:08 +0100
+Subject: [PATCH] url: do not reuse a non-tls starttls connection if new
+ requires TLS
+
+Reported-by: Arkadi Vainbrand
+
+Closes #21082
+
+CVE: CVE-2026-4873
+Upstream-Status: Backport [https://github.com/curl/curl/commit/507e7be573b0a76fca597b75ff7cb27a66e7d865]
+
+(cherry picked from commit 507e7be573b0a76fca597b75ff7cb27a66e7d865)
+Signed-off-by: Deepak Rathore <deeratho@cisco.com>
+---
+ lib/url.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/lib/url.c b/lib/url.c
+index 7c24f1a002..4ebff50ef1 100644
+--- a/lib/url.c
++++ b/lib/url.c
+@@ -745,7 +745,7 @@ struct url_conn_match {
+   BIT(want_proxy_ntlm_http);
+   BIT(want_nego_http);
+   BIT(want_proxy_nego_http);
+-
++  BIT(req_tls); /* require TLS use from a clear-text start */
+   BIT(wait_pipe);
+   BIT(force_reuse);
+   BIT(seen_pending_conn);
+@@ -897,6 +897,9 @@ static bool url_match_ssl_use(struct connectdata *conn,
+        (get_protocol_family(conn->scheme) != m->needle->scheme->protocol))
+       return FALSE;
+   }
++  else if(m->req_tls)
++    /* a clear-text STARTTLS protocol with required TLS */
++    return FALSE;
+   return TRUE;
+ }
+ 
+@@ -1361,6 +1364,7 @@ static bool url_attach_existing(struct Curl_easy *data,
+     (needle->scheme->protocol & PROTO_FAMILY_HTTP);
+ #endif
+ #endif
++  match.req_tls = data->set.use_ssl >= CURLUSESSL_CONTROL;
+ 
+   /* Find a connection in the pool that matches what "data + needle"
+    * requires. If a suitable candidate is found, it is attached to "data". */
+-- 
+2.35.6
diff --git a/meta/recipes-support/curl/curl_8.19.0.bb b/meta/recipes-support/curl/curl_8.19.0.bb
index 097b3056d8..5ba881bd76 100644
--- a/meta/recipes-support/curl/curl_8.19.0.bb
+++ b/meta/recipes-support/curl/curl_8.19.0.bb
@@ -22,6 +22,7 @@ SRC_URI = " \
     file://CVE-2026-6429-dependent.patch \
     file://CVE-2026-6429.patch \
     file://CVE-2026-7168.patch \
+    file://CVE-2026-4873.patch \
 "
 
 SRC_URI:append:class-nativesdk = " \