Details: https://nvd.nist.gov/vuln/detail/CVE-2026-1642
Pick the commit that was identified by the reporter on the oss-sec mailing list[1] [1]: https://www.openwall.com/lists/oss-security/2026/02/05/1 Signed-off-by: Gyorgy Sarvari <[email protected]> --- .../nginx/files/CVE-2026-1642.patch | 46 +++++++++++++++++++ meta-webserver/recipes-httpd/nginx/nginx.inc | 1 + 2 files changed, 47 insertions(+) create mode 100644 meta-webserver/recipes-httpd/nginx/files/CVE-2026-1642.patch diff --git a/meta-webserver/recipes-httpd/nginx/files/CVE-2026-1642.patch b/meta-webserver/recipes-httpd/nginx/files/CVE-2026-1642.patch new file mode 100644 index 0000000000..7cbdda6adc --- /dev/null +++ b/meta-webserver/recipes-httpd/nginx/files/CVE-2026-1642.patch @@ -0,0 +1,46 @@ +From 12a0f6a27e77b09807c93d9e4f8605c0dc37e21f Mon Sep 17 00:00:00 2001 +From: Roman Arutyunyan <[email protected]> +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. + +CVE: CVE-2026-1642 +Upstream-Status: Backport [https://github.com/nginx/nginx/commit/a59f5f099a89dc8eaebd48077292313f9f7e33e3] +Signed-off-by: Gyorgy Sarvari <[email protected]> +--- + 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; diff --git a/meta-webserver/recipes-httpd/nginx/nginx.inc b/meta-webserver/recipes-httpd/nginx/nginx.inc index 865d7f86ee..722e2508d4 100644 --- a/meta-webserver/recipes-httpd/nginx/nginx.inc +++ b/meta-webserver/recipes-httpd/nginx/nginx.inc @@ -27,6 +27,7 @@ SRC_URI = " \ file://CVE-2024-7347-2.patch \ file://CVE-2025-53859.patch \ file://CVE-2025-23419.patch \ + file://CVE-2026-1642.patch \ " inherit siteinfo update-rc.d useradd systemd
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