CVE-2026-42946

A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.  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 Open Source have a vulnerability in the ngx_http_ssl_module module when the ssl_verify_client directive is set to "on" or "optional," and the ssl_ocsp directive is set to "on" or the leaf parameters are configured with a resolver. With this configuration, an unauthenticated attacker can send requests along with conditions beyond its control that may cause a heap-use-after-free error in the NGINX worker process. This vulnerability may result in limited modification of data or the NGINX worker process restarting. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-40701)

NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, source_charset, and charset_map and proxy_pass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' 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-2026-42934)

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, for systems with Address Space Layout Randomization (ASLR ) disabled, code execution is possible.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42945)

A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42946)

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 Open Source have a vulnerability in the ngx_http_ssl_module module when the ssl_verify_client directive is set to "on" or "optional," and the ssl_ocsp directive is set to "on" or the leaf parameters are configured with a resolver. With this configuration, an unauthenticated attacker can send requests along with conditions beyond its control that may cause a heap-use-after-free error in the NGINX worker process. This vulnerability may result in limited modification of data or the NGINX worker process restarting. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-40701)

NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, source_charset, and charset_map and proxy_pass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' 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-2026-42934)

A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42946)

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 Open Source have a vulnerability in the ngx_http_ssl_module module when the ssl_verify_client directive is set to "on" or "optional," and the ssl_ocsp directive is set to "on" or the leaf parameters are configured with a resolver. With this configuration, an unauthenticated attacker can send requests along with conditions beyond its control that may cause a heap-use-after-free error in the NGINX worker process. This vulnerability may result in limited modification of data or the NGINX worker process restarting. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-40701)

NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, source_charset, and charset_map and proxy_pass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' 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-2026-42934)

A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42946)

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 Open Source have a vulnerability in the ngx_http_ssl_module module when the ssl_verify_client directive is set to "on" or "optional," and the ssl_ocsp directive is set to "on" or the leaf parameters are configured with a resolver. With this configuration, an unauthenticated attacker can send requests along with conditions beyond its control that may cause a heap-use-after-free error in the NGINX worker process. This vulnerability may result in limited modification of data or the NGINX worker process restarting. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-40701)

NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, source_charset, and charset_map and proxy_pass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' 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-2026-42934)

A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42946)

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 Open Source have a vulnerability in the ngx_http_ssl_module module when the ssl_verify_client directive is set to "on" or "optional," and the ssl_ocsp directive is set to "on" or the leaf parameters are configured with a resolver. With this configuration, an unauthenticated attacker can send requests along with conditions beyond its control that may cause a heap-use-after-free error in the NGINX worker process. This vulnerability may result in limited modification of data or the NGINX worker process restarting. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-40701)

NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, source_charset, and charset_map and proxy_pass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' 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-2026-42934)

A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42946)

A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

• SECURITY UPDATE: excessive memory allocation and out-of-bounds read in ngx_http_scgi_module and ngx_http_uwsgi_module status line parsing
  • debian/patches/CVE-2026-42946.patch: save u->buffer.pos into r->header_name_start before parsing the status line and restore it on the NGX_ERROR fallback in ngx_http_scgi_process_status_line() and ngx_http_uwsgi_process_status_line(), then reset r->state to 0 so an unrecognised upstream status line no longer leaves the parser in a stale state that can over-read worker process memory or crash the worker; the same backtracking is also applied to ngx_http_proxy_module
  • CVE-2026-42946

• SECURITY UPDATE: excessive memory allocation or over-read in scgi and uwsgi status line parsing
  • debian/patches/CVE-2026-42946.patch: excessive memory allocation or over-read in scgi and uwsgi status line parsing
  • CVE-2026-42946

• SECURITY UPDATE: excessive memory allocation or over-read in scgi and uwsgi status line parsing
  • debian/patches/CVE-2026-42946.patch: excessive memory allocation or over-read in scgi and uwsgi status line parsing
  • CVE-2026-42946

• CVE-2026-42946: fix buffer over-read and excessive memory allocation in ngx_http_scgi_module and ngx_http_uwsgi_module when an upstream server returns an unrecognized status line; reset r->state before falling back to header parsing so the header parser no longer resumes from a status-line state and reads through an uninitialized r->header_name_start, and reuse r->header_name_start to backtrack the buffer position for status lines split across reads

• 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

• CVE-2026-42946: reset the status-line parser state on fallback so scgi and uwsgi header parsing can't alias into a leftover FSM state and leak worker memory into response headers

• CVE-2026-42946: reset the status-line parser state on fallback so scgi and uwsgi header parsing can't alias into a leftover FSM state and leak worker memory into response headers

• CVE-2026-42946: reset the status-line parser state on fallback so scgi and uwsgi header parsing can't alias into a leftover FSM state and leak worker memory into response headers

• CVE-2026-42946: reset the upstream parser state and restore the response buffer position when a status line is not recognised, so proxy, scgi and uwsgi header parsing no longer continues in a stale state or drops already-read data

• CVE-2026-42946: reset the upstream parser state and restore the response buffer position when a status line is not recognised, so proxy, scgi and uwsgi header parsing no longer continues in a stale state or drops already-read data

• CVE-2026-42946: reset the upstream parser state and restore the response buffer position when a status line is not recognised, so proxy, scgi and uwsgi header parsing no longer continues in a stale state or drops already-read data

NGINX ngx_quic_module vulnerability. (CVE-2026-40460) NGINX ngx_http_ssl_module vulnerability. (CVE-2026-40701) NGINX ngx_http_proxy_v2_module vulnerability. (CVE-2026-42926) NGINX ngx_http_charset_module vulnerability. (CVE-2026-42934) NGINX ngx_http_rewrite_module vulnerability. (CVE-2026-42945) NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability. (CVE-2026-42946)

These are all security issues fixed in the nginx-1.31.0-1.1 package on the GA media of openSUSE Tumbleweed.

This update for nginx fixes the following issues

• CVE-2026-27651: denial of service via undisclosed requests when the ngx_mail_auth_http_module is enabled (bsc#1260415).
• CVE-2026-32647: NGINX worker memory over-read or over-write via a specially crafted MP4 file (bsc#1260420).
• CVE-2026-40701: heap use-after-free in the worker process when the ssl_verify_client and the ssl_ocsp directives are set due to issue in the ngx_http_ssl_module module (bsc#1265229).
• CVE-2026-42934: heap buffer overread in the worker process due to issue in the ngx_http_charset_module module (bsc#1265231).
• CVE-2026-42945: heap buffer overflow via crafted HTTP requests due to issue in ngx_http_rewrite_module (bsc#1265232).
• CVE-2026-42946: excessive memory allocation and data overread due to issue in the ngx_http_scgi_module and ngx_http_uwsgi_module modules (bsc#1265233).

Root has patched CVE-2026-42946 in the nginx package for Root:Alpine:3.15. Multiple fixed versions available.

Root has patched CVE-2026-42946 in the nginx package for Root:Alpine:3.20. Multiple fixed versions available.

This update for nginx fixes the following issues

• CVE-2026-27651: denial of service via undisclosed requests when the ngx_mail_auth_http_module is enabled (bsc#1260415).
• CVE-2026-32647: NGINX worker memory over-read or over-write via a specially crafted MP4 file (bsc#1260420).
• CVE-2026-40701: heap use-after-free in the worker process when the ssl_verify_client and the ssl_ocsp directives are set due to issue in the ngx_http_ssl_module module (bsc#1265229).
• CVE-2026-42934: heap buffer overread in the worker process due to issue in the ngx_http_charset_module module (bsc#1265231).
• CVE-2026-42945: heap buffer overflow via crafted HTTP requests due to issue in ngx_http_rewrite_module (bsc#1265232).
• CVE-2026-42946: excessive memory allocation and data overread due to issue in the ngx_http_scgi_module and ngx_http_uwsgi_module modules (bsc#1265233).

This update for nginx fixes the following issues

• CVE-2026-27651: denial of service via undisclosed requests when the ngx_mail_auth_http_module is enabled (bsc#1260415).
• CVE-2026-32647: NGINX worker memory over-read or over-write via a specially crafted MP4 file (bsc#1260420).
• CVE-2026-40701: heap use-after-free in the worker process when the ssl_verify_client and the ssl_ocsp directives are set due to issue in the ngx_http_ssl_module module (bsc#1265229).
• CVE-2026-42934: heap buffer overread in the worker process due to issue in the ngx_http_charset_module module (bsc#1265231).
• CVE-2026-42945: heap buffer overflow via crafted HTTP requests due to issue in ngx_http_rewrite_module (bsc#1265232).
• CVE-2026-42946: excessive memory allocation and data overread due to issue in the ngx_http_scgi_module and ngx_http_uwsgi_module modules (bsc#1265233).

This update for nginx fixes the following issues

• CVE-2026-9256: heap buffer overflow in the ngx_http_rewrite_module when using a configuration with overlapping captures (bsc#1266215).
• CVE-2026-27651: denial of service via undisclosed requests when the ngx_mail_auth_http_module is enabled (bsc#1260415).
• CVE-2026-32647: NGINX worker memory over-read or over-write via a specially crafted MP4 file (bsc#1260420).
• CVE-2026-40701: heap use-after-free in the worker process when the ssl_verify_client and the ssl_ocsp directives are set due to issue in the ngx_http_ssl_module module (bsc#1265229).
• CVE-2026-42934: heap buffer overread in the worker process due to issue in the ngx_http_charset_module module (bsc#1265231).
• CVE-2026-42945: heap buffer overflow via crafted HTTP requests due to issue in ngx_http_rewrite_module (bsc#1265232).
• CVE-2026-42946: excessive memory allocation and data overread due to issue in the ngx_http_scgi_module and ngx_http_uwsgi_module modules (bsc#1265233).