Debian LTS Nginx Critical Remote Code Exec Denial of Service DLA-4660-1

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