F5 Nginx Open Source vulnerabilities

CVE-2026-42945 [HIGH] CWE-122 CVE-2026-42945: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vu 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 unauthent

CVE-2026-27654 [HIGH] CWE-122 CVE-2026-27654: NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_dav_module module that might a NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_dav_module module that might allow an attacker to trigger a buffer overflow to the NGINX worker process; this vulnerability may result in termination of the NGINX worker process or modification of source or destination file names outside the document root. This issue affects NGINX O

CVE-2026-9256 [HIGH] CWE-122 CVE-2026-9256: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vu NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in

CVE-2026-42055 [HIGH] CWE-122 CVE-2026-42055: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_g 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 tha

CVE-2026-42530 [HIGH] CWE-416 CVE-2026-42530: NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is co NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This may cause a Use-after-Free in the NGINX worker process

CVE-2026-42533 [HIGH] CWE-122 CVE-2026-42533: A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and a string expression references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. An unauth

CVE-2026-60005 [HIGH] CWE-908 CVE-2026-60005: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_slice_module module. When the NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_slice_module module. When the slice directive and unnamed regex captures are configured or when a background cache update happens, unauthenticated attackers can send requests that may cause uninitialized memory access in the NGINX worker process, leading to limited disclosure of memo

CVE-2026-32647 [HIGH] CWE-125 CVE-2026-32647: NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_mp4_module module, which might NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_mp4_module module, which might allow an attacker to trigger a buffer over-read or over-write to the NGINX worker memory resulting in its termination or possibly code execution, using a specially crafted MP4 file. This issue affects NGINX Open Source and NGINX Plus if it is built wit

CVE-2026-42946 [HIGH] CWE-789 CVE-2026-42946: A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result 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 NGI

CVE-2026-27651 [HIGH] CWE-476 CVE-2026-27651: When the ngx_mail_auth_http_module module is enabled on NGINX Plus or NGINX Open Source, undisclosed When the ngx_mail_auth_http_module module is enabled on NGINX Plus or NGINX Open Source, undisclosed requests can cause worker processes to terminate. This issue may occur when (1) CRAM-MD5 or APOP authentication is enabled, and (2) the authentication server permits retry by returning the Auth-Wait response header. Note: Software versions which have r

CVE-2026-56434 [MEDIUM] CWE-416 CVE-2026-56434: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulner NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and proxy_buffering off directives are configured. With this configuration, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream serv

CVE-2024-24989 [HIGH] CWE-476 CVE-2024-24989: When NGINX Plus or NGINX OSS are configured to use the HTTP/3 QUIC module, undisclosed requests can When NGINX Plus or NGINX OSS are configured to use the HTTP/3 QUIC module, undisclosed requests can cause NGINX worker processes to terminate. Note: The HTTP/3 QUIC module is not enabled by default and is considered experimental. For more information, refer to Support for QUIC and HTTP/3 https://nginx.org/en/docs/quic.html . NOTE: Software versions

CVE-2024-24990 [HIGH] CWE-416 CVE-2024-24990: When NGINX Plus or NGINX OSS are configured to use the HTTP/3 QUIC module, undisclosed requests can When NGINX Plus or NGINX OSS are configured to use the HTTP/3 QUIC module, undisclosed requests can cause NGINX worker processes to terminate. Note: The HTTP/3 QUIC module is not enabled by default and is considered experimental. For more information, refer to Support for QUIC and HTTP/3 https://nginx.org/en/docs/quic.html . Note: Software versio

CVE-2026-40460 [MEDIUM] CWE-290 CVE-2026-40460: When NGINX Plus or NGINX Open Source are configured to use the HTTP/3 QUIC module, an attacker may b When NGINX Plus or NGINX Open Source are configured to use the HTTP/3 QUIC module, an attacker may be able to spoof their source IP address allowing for bypass of authorization or bypass of rate limiting. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVE-2026-1642 [MEDIUM] CWE-349 CVE-2026-1642: A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport La A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side—along with conditions beyond the attacker's control—may be able to inject plain text data into the response from an upstream proxied server. Not

CVE-2024-32760 [MEDIUM] CWE-787 CVE-2024-32760: When NGINX Plus or NGINX OSS are configured to use the HTTP/3 QUIC module, undisclosed HTTP/3 encode When NGINX Plus or NGINX OSS are configured to use the HTTP/3 QUIC module, undisclosed HTTP/3 encoder instructions can cause NGINX worker processes to terminate or cause or other potential impact.

CVE-2026-42926 [MEDIUM] CWE-172 CVE-2026-42926: When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVE-2026-48142 [MEDIUM] CWE-125 CVE-2026-48142: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When co 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 con

CVE-2026-27784 [MEDIUM] CWE-190 CVE-2026-27784: The 32-bit implementation of NGINX Open Source has a vulnerability in the ngx_http_mp4_module module The 32-bit implementation of NGINX Open Source has a vulnerability in the ngx_http_mp4_module module, which might allow an attacker to over-read or over-write NGINX worker memory resulting in its termination, using a specially crafted MP4 file. The issue only affects 32-bit NGINX Open Source if it is built with the ngx_http_mp4_module module and the

CVE-2026-42934 [MEDIUM] CWE-125 CVE-2026-42934: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When ch NGINX Plus and 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 NGI