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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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