Debian alert DLA-4667-1 (nginx)

From:
             
 
Carlos Henrique Lima Melara <charles@debian.org>
To:
             
 
debian-lts-announce@lists.debian.org
Subject:
             
 
[SECURITY] [DLA 4667-1] nginx security update
Date:
             
 
Fri, 03 Jul 2026 18:39:15 -0300
Message-ID:
             
 
<akgr8CL8uHp3i6jL@fw13.lan>
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Debian LTS Advisory DLA-4667-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/          Carlos Henrique Lima Melara
July 03, 2026                                 https://wiki.debian.org/LTS
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Package        : nginx
Version        : 1.22.1-9+deb12u9
CVE ID         : CVE-2026-42055 CVE-2026-48142
Debian Bug     : 1140359 1140361

Multiple vulnerabilities were discoverd in Nginx, a high-performance web
and reverse proxy server, which could result in remote code execution,
denial of service or memory disclosure.

CVE-2026-42055

    NGINX Open Source has a vulnerability in the ngx_http_proxy_v2_module and
    ngx_http_grpc_module modules. This vulnerability exists when the
    proxy_http_version to 2 or grpc_pass directives are used to proxy HTTP/2
    traffic, the ignore_invalid_headers directive is set to off, and the
    large_client_header_buffers directive size is larger than 2 megabytes. A
    remote, unauthenticated attacker, along with conditions beyond their
    control, could send large headers while creating an upstream request. This
    may cause a heap-based buffer overflow in the NGINX worker process leading
    to a restart. Additionally, attackers can execute code on systems with
    Address Space Layout Randomization (ASLR) disabled or when the attacker can
    bypass ASLR.

CVE-2026-48142

   NGINX Open Source has a vulnerability in the ngx_http_charset_module module.
   When content is served or proxied through a location block with both
   source_charset utf-8; and a charset directive (for example, charset koi8-r;)
   configured, remote, unauthenticated attackers can send requests (in
   conjunction with conditions beyond their control) to cause a heap buffer
   over-read in the NGINX worker process, leading to limited disclosure of
   memory or a restart.

For Debian 12 bookworm, these problems have been fixed in version
1.22.1-9+deb12u9.

We recommend that you upgrade your nginx packages.

For the detailed security status of nginx please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/nginx

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS


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