diff --git a/nginx-1.26.3-CVE-2026-1642.patch b/nginx-1.26.3-CVE-2026-1642.patch
new file mode 100644
index 0000000000000000000000000000000000000000..9a258dcdbe7cff230ce62e10664c2031e2b0e20c
--- /dev/null
+++ b/nginx-1.26.3-CVE-2026-1642.patch
@@ -0,0 +1,44 @@
+From 784fa05025cb8cd0c770f99bc79d2794b9f85b6e Mon Sep 17 00:00:00 2001
+From: Roman Arutyunyan <arut@nginx.com>
+Date: Thu, 29 Jan 2026 13:27:32 +0400
+Subject: [PATCH] Upstream: detect premature plain text response from SSL
+ backend.
+
+When connecting to a backend, the connection write event is triggered
+first in most cases.  However if a response arrives quickly enough, both
+read and write events can be triggered together within the same event loop
+iteration.  In this case the read event handler is called first and the
+write event handler is called after it.
+
+SSL initialization for backend connections happens only in the write event
+handler since SSL handshake starts with sending Client Hello.  Previously,
+if a backend sent a quick plain text response, it could be parsed by the
+read event handler prior to starting SSL handshake on the connection.
+The change adds protection against parsing such responses on SSL-enabled
+connections.
+
+
+---
+ src/http/ngx_http_upstream.c |    9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
+index 2ce9f21..70c3b46 100644
+--- a/src/http/ngx_http_upstream.c
++++ b/src/http/ngx_http_upstream.c
+@@ -2461,6 +2461,15 @@ ngx_http_upstream_process_header(ngx_http_request_t *r, ngx_http_upstream_t *u)
+             return;
+         }
+ 
++#if (NGX_HTTP_SSL)
++        if (u->ssl && c->ssl == NULL) {
++            ngx_log_error(NGX_LOG_ERR, c->log, 0,
++                          "upstream prematurely sent response");
++            ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR);
++            return;
++        }
++#endif
++
+         u->state->bytes_received += n;
+ 
+         u->buffer.last += n;
diff --git a/nginx.spec b/nginx.spec
index 33d7896b3fe9b5b0c909359b6e3bd67565d3c36f..52c0a3e64f7b7fe900d08f53dfae2b3804199d58 100644
--- a/nginx.spec
+++ b/nginx.spec
@@ -27,7 +27,7 @@
 
 Name:              nginx
 Version:           1.26.3
-Release:           2%{?dist}
+Release:           3%{?dist}
 Summary:           A high performance web server and reverse proxy server
 License:           BSD
 URL:               https://nginx.org
@@ -52,6 +52,8 @@ Source210:         UPGRADE-NOTES-1.6-to-1.10
 Source300:          https://github.com/arut/nginx-dav-ext-module/archive/v%{dav_ext_version}/nginx-dav-ext-module-%{dav_ext_version}.tar.gz
 Source301:          https://github.com/openresty/headers-more-nginx-module/archive/v%{headers_more_version}/headers-more-nginx-module-%{headers_more_version}.tar.gz
 
+Patch0001:          nginx-1.26.3-CVE-2026-1642.patch
+
 BuildRequires:     make, gcc
 BuildRequires:     openssl-devel, pcre2-devel, zlib-devel, systemd
 %if 0%{?with_gperftools}
@@ -536,6 +538,10 @@ fi
 
 
 %changelog
+* Tue Apr 14 2026 PkgAgent Robot <pkgagent@opencloudos.tech> - 1.26.3-3
+- [Type] security
+- [DESC] Fix CVE-2026-1642 vulnerability - detect premature plain text response from SSL backend
+
 * Mon Mar 09 2026 zidonghuang <zidonghuang@tencent.com> - 1.26.3-2
 - [Type] enhancement
 - [DESC] add nginx-dav-ext-module and headers-more-nginx-module for full WebDAV support