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Resolves: RHEL-146517 - nginx:1.24/nginx: NGINX: Data injection via

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man-in-the-middle attack on TLS proxied connections (CVE-2026-1642)
This commit is contained in:
Luboš Uhliarik 2026-02-23 00:19:57 +01:00
parent 54ad9b19be
commit c74223fa5f
2 changed files with 55 additions and 1 deletions
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45
0007-Upstream-detect-premature-plain-text-response-from-S.patch Normal file
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@ -0,0 +1,45 @@
From bad28aaf4bc2e882b2d006387d79c354579a2a9a 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 3ae822b..6c310d8 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -2441,6 +2441,15 @@ 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;
--
2.44.0

11
nginx.spec
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@ -30,7 +30,7 @@
Name: nginx
Epoch: 1
Version: 1.24.0
Release: 1%{?dist}
Release: 2%{?dist}
Summary: A high performance web server and reverse proxy server
Group: System Environment/Daemons
@ -77,6 +77,10 @@ Patch5: nginx-1.18.0-pkcs11-cert.patch
# https://issues.redhat.com/browse/RHEL-12728
Patch6: nginx-1.22-CVE-2023-44487.patch
# https://issues.redhat.com/browse/RHEL-146516
# upstream patch - https://github.com/nginx/nginx/commit/784fa05025cb8cd0c770f99bc79d2794b9f85b6e
Patch7: 0007-Upstream-detect-premature-plain-text-response-from-S.patch
%if 0%{?with_gperftools}
BuildRequires: gperftools-devel
%endif
@ -234,6 +238,7 @@ Requires: zlib-devel
%patch4 -p1
%patch5 -p1
%patch6 -p1
%patch7 -p1
cp %{SOURCE200} %{SOURCE210} %{SOURCE10} %{SOURCE12} .
@ -546,6 +551,10 @@ fi
%{nginx_srcdir}/
%changelog
* Sun Feb 22 2026 Luboš Uhliarik <luhliari@redhat.com> - 1:1.24.0-2
- Resolves: RHEL-146517 - nginx:1.24/nginx: NGINX: Data injection via
man-in-the-middle attack on TLS proxied connections (CVE-2026-1642)
* Thu Jan 18 2024 Luboš Uhliarik <luhliari@redhat.com> - 1:1.24.0-1
- Resolves: RHEL-14714 - add nginx:1.24 to RHEL 8.10