CVE-2026-48142

NGINX Plus and NGINX Open Source have 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.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

NGINX Plus and NGINX Open Source have 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. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

NGINX is a free, open-source, high-performance HTTP server and reverse proxy, as well as an IMAP/POP3 proxy server.

Security Fix(es):

NGINX Plus and NGINX Open Source have 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.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42055)

NGINX Plus and NGINX Open Source have 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.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-48142)

NGINX is a free, open-source, high-performance HTTP server and reverse proxy, as well as an IMAP/POP3 proxy server.

Security Fix(es):

NGINX Plus and NGINX Open Source have 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.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42055)

NGINX Plus and NGINX Open Source have 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.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-48142)

NGINX is a free, open-source, high-performance HTTP server and reverse proxy, as well as an IMAP/POP3 proxy server.

Security Fix(es):

NGINX Plus and NGINX Open Source have 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.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42055)

NGINX Plus and NGINX Open Source have 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.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-48142)

NGINX is a free, open-source, high-performance HTTP server and reverse proxy, as well as an IMAP/POP3 proxy server.

Security Fix(es):

NGINX Plus and NGINX Open Source have 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.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42055)

NGINX Plus and NGINX Open Source have 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.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-48142)

NGINX Plus and NGINX Open Source have 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. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

NGINX Plus and NGINX Open Source have 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.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

NGINX Plus and NGINX Open Source have 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.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

NGINX Plus and NGINX Open Source have 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.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

NGINX Plus and NGINX Open Source have 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.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

• CVE-2026-48142: heap out-of-bounds read in ngx_http_charset_recode_from_utf8() when an invalid UTF-8 sequence split across buffers rewinds src before the buffer start, on locations recoding source_charset utf-8 to another charset

• CVE-2026-48142: heap out-of-bounds read in ngx_http_charset_recode_from_utf8() when an invalid UTF-8 sequence split across buffers rewinds src before the buffer start, on locations recoding source_charset utf-8 to another charset

• CVE-2026-48142: heap out-of-bounds read in ngx_http_charset_recode_from_utf8() when an invalid UTF-8 sequence split across buffers rewinds src before the buffer start, on locations recoding source_charset utf-8 to another charset

• CVE-2025-53859: fix buffer over-read in the SMTP authentication path that could disclose worker process memory to the authentication server
• CVE-2026-28753: validate host names resolved from the client address to prevent header injection into auth_http and XCLIENT requests
• CVE-2026-40701: fix use-after-free by cancelling a pending OCSP responder resolve when the client connection is closed
• CVE-2026-42934: fix buffer over-read in the charset filter when a UTF-8 sequence is split across several buffers
• CVE-2026-48142: fix remaining buffer over-read in the charset filter on invalid UTF-8 sequences
• CVE-2026-42946: reset the parsing state and restore the buffer position after an unrecognized upstream status line in the scgi and uwsgi modules

ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerability. (CVE-2026-42055) ngx_http_charset_module vulnerability. (CVE-2026-48142)

These are all security issues fixed in the nginx-1.31.2-1.1 package on the GA media of openSUSE Tumbleweed.

This update for nginx fixes the following issues

• CVE-2026-40460: bypass of authorization and bypass of rate limiting when NGINX is configured to use the HTTP/3 QUIC module (bsc#1265228).
• CVE-2026-42055: heap-based buffer overflow in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules (bsc#1268492).
• CVE-2026-48142: heap buffer over-read in the ngx_http_charset_module module (bsc#1268495).
• HTTP2-BOMB denial of service (bsc#1267525).

This update for nginx fixes the following issues

• CVE-2026-40460: bypass of authorization and bypass of rate limiting when NGINX is configured to use the HTTP/3 QUIC module (bsc#1265228).
• CVE-2026-42055: heap-based buffer overflow in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules (bsc#1268492).
• CVE-2026-48142: heap buffer over-read in the ngx_http_charset_module module (bsc#1268495).
• HTTP2-BOMB denial of service (bsc#1267525).

This update for nginx fixes the following issues

• CVE-2026-40460: bypass of authorization and bypass of rate limiting when NGINX is configured to use the HTTP/3 QUIC module (bsc#1265228).
• CVE-2026-42055: heap-based buffer overflow in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules (bsc#1268492).
• CVE-2026-48142: heap buffer over-read in the ngx_http_charset_module module (bsc#1268495).
• HTTP2-BOMB denial of service (bsc#1267525).

This update for nginx fixes the following issues

• CVE-2026-42055: heap-based buffer overflow in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules (bsc#1268492).
• CVE-2026-48142: heap buffer over-read in the ngx_http_charset_module module (bsc#1268495).
• Remote denial of service via the HTTP/2 bomb exploit (bsc#1267525).

This update for nginx fixes the following issues:

• CVE-2026-42055: heap buffer overflow in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules (bsc#1268492).
• CVE-2026-42533: heap buffer overflow in the map directive and regex matching (bsc#1271514).
• CVE-2026-48142: heap buffer overread in the ngx_http_charset_module module (bsc#1268495).
• Remote denial of service via the HTTP/2 bomb exploit (bsc#1267525).