nginx: Fix CVE-2026-40701

This patch applies the upstream fix as referenced in [2], using the
commit shown in [1].

[1] https://github.com/nginx/nginx/commit/d2b8d47741820c9fb134c6731ecb40b21f3085b1
[2] https://nginx.org/en/security_advisories.html

Signed-off-by: Hetvi Thakar <hthakar@cisco.com>
Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>

meta-webserver/recipes-httpd/nginx/files/CVE-2026-40701.patch

@@ -0,0 +1,74 @@
+From d2b8d47741820c9fb134c6731ecb40b21f3085b1 Mon Sep 17 00:00:00 2001
+From: Roman Arutyunyan <arut@nginx.com>
+Date: Tue, 21 Apr 2026 14:51:41 +0400
+Subject: [PATCH] OCSP: resolve cleanup on connection close
+
+Previously, when a client SSL connection was terminated (typically due to a
+timeout) while resolving an OCSP responder, the OCSP context was freed, but
+the resolve context was not.  This resulted in use-after-free on resolve
+completion.
+
+Reported by Leo Lin.
+
+CVE: CVE-2026-40701
+Upstream-Status: Backport [https://github.com/nginx/nginx/commit/d2b8d47741820c9fb134c6731ecb40b21f3085b1]
+
+(cherry picked from commit d2b8d47741820c9fb134c6731ecb40b21f3085b1)
+Signed-off-by: Hetvi Thakar <hthakar@cisco.com>
+---
+ src/event/ngx_event_openssl_stapling.c | 11 +++++++++++
+ 1 file changed, 11 insertions(+)
+
+diff --git a/src/event/ngx_event_openssl_stapling.c b/src/event/ngx_event_openssl_stapling.c
+index a0a8031c7..231bdeceb 100644
+--- a/src/event/ngx_event_openssl_stapling.c
++++ b/src/event/ngx_event_openssl_stapling.c
+@@ -113,6 +113,7 @@ struct ngx_ssl_ocsp_ctx_s {
+ 
+     ngx_resolver_t              *resolver;
+     ngx_msec_t                   resolver_timeout;
++    ngx_resolver_ctx_t          *resolve;
+ 
+     ngx_msec_t                   timeout;
+ 
+@@ -1341,6 +1342,10 @@ ngx_ssl_ocsp_done(ngx_ssl_ocsp_ctx_t *ctx)
+     ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ctx->log, 0,
+                    "ssl ocsp done");
+ 
++    if (ctx->resolve) {
++        ngx_resolve_name_done(ctx->resolve);
++    }
++
+     if (ctx->peer.connection) {
+         ngx_close_connection(ctx->peer.connection);
+     }
+@@ -1433,7 +1438,10 @@ ngx_ssl_ocsp_request(ngx_ssl_ocsp_ctx_t *ctx)
+         resolve->data = ctx;
+         resolve->timeout = ctx->resolver_timeout;
+ 
++        ctx->resolve = resolve;
++
+         if (ngx_resolve_name(resolve) != NGX_OK) {
++            ctx->resolve = NULL;
+             ngx_ssl_ocsp_error(ctx);
+             return;
+         }
+@@ -1522,6 +1530,7 @@ ngx_ssl_ocsp_resolve_handler(ngx_resolver_ctx_t *resolve)
+     }
+ 
+     ngx_resolve_name_done(resolve);
++    ctx->resolve = NULL;
+ 
+     ngx_ssl_ocsp_connect(ctx);
+     return;
+@@ -1529,6 +1538,8 @@ ngx_ssl_ocsp_resolve_handler(ngx_resolver_ctx_t *resolve)
+ failed:
+ 
+     ngx_resolve_name_done(resolve);
++    ctx->resolve = NULL;
++
+     ngx_ssl_ocsp_error(ctx);
+ }
+ 
+-- 
+2.35.6

meta-webserver/recipes-httpd/nginx/nginx_1.28.3.bb

@@ -1,5 +1,9 @@
 require nginx.inc
 
+SRC_URI:append = " \
+    file://CVE-2026-40701.patch \
+"
+
 LIC_FILES_CHKSUM = "file://LICENSE;md5=3dc49537b08b14c8b66ad247bb4c4593"
 
 SRC_URI[sha256sum] = "2c96a946bfb0882a21744ed429770a2123ae1828c7c48665092993ddee91a918"

meta-webserver/recipes-httpd/nginx/nginx_1.29.7.bb

@@ -1,5 +1,9 @@
 require nginx.inc
 
+SRC_URI:append = " \
+    file://CVE-2026-40701.patch \
+"
+
 # 1.28.x branch is the current stable branch, the recommended default
 # 1.29.x is the current mainline branches containing all new features
 DEFAULT_PREFERENCE = "-1"