Debian alert DLA-4660-1 (nginx)

From:
             
 
Carlos Henrique Lima Melara <charles@debian.org>
To:
             
 
debian-lts-announce@lists.debian.org
Subject:
             
 
[SECURITY] [DLA 4660-1] nginx security update
Date:
             
 
Tue, 30 Jun 2026 23:59:41 -0300
Message-ID:
             
 
<akSCjzXaMj_RnHuK@fw13.lan>
-------------------------------------------------------------------------
Debian LTS Advisory DLA-4660-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/          Carlos Henrique Lima Melara
June 30, 2026                                 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package        : nginx
Version        : 1.18.0-6.1+deb11u8
CVE ID         : CVE-2026-42055 CVE-2026-48142
Debian Bug     : 1138794 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.

No CVE assigned yet

    HTTP/2 Bomb denial of service

For Debian 11 bullseye, these problems have been fixed in version
1.18.0-6.1+deb11u8.

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


Attachment: signature.asc (type=application/pgp-signature)
-----BEGIN PGP SIGNATURE-----
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=9kFR
-----END PGP SIGNATURE-----