According to its Server response header, the installed version of nginx is 1.30.0 prior to 1.30.4, or 1.31.2 prior to 1.31.3. It is, therefore, affected by multiple vulnerabilities:

  - 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 unauthenticated attacker along with conditions beyond their 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, attackers can execute code on systems with Address Space     Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Impact: This vulnerability may     allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or to possibly trigger a code     execution. There is no control plane exposure; this is a data plane issue only. (CVE-2026-42533)

  - 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 server may be able to cause a use-after-free in the NGINX worker process. This     issue may lead to limited modification of memory or a restart of the NGINX worker process. Impact: This     vulnerability may allow remote attackers to have limited control to modify memory contents or restart the     NGINX worker process. There is no control plane exposure; this is a data plane issue only. (CVE-2026-56434)

  - 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 memory or a restart. Impact: This vulnerability may allow remote,     unauthenticated attackers to have limited control to disclose memory contents or restart the NGINX worker     process. There is no control plane exposure; this is a data plane issue only. Note: The     ngx_http_slice_module module is not enabled by default; it's enabled with the --with-http_slice_module     configuration parameter. (CVE-2026-60005)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Detections

Analytics

nginx 1.30.x < 1.30.4 / 1.31.2 < 1.31.3 Multiple Vulnerabilities

critical Nessus Plugin ID 330084

Version 1.2

Version 1.1

Version 1.2 Jul 29, 2026, 3:16 PM CVSS metrics ("CVSSv3 score" set to 8.1) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H") CVSS metrics ("Cvssv4 score" set to 9.2) CVSS metrics ("Cvssv4 threat vector" set to "CVSS:4.0/E:P") CVSS metrics ("Cvssv4 vector" set to "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N") CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:POC/RL:OF/RC:C") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:P/RL:O/RC:C") CVSSv3 score source (set to "CVE-2026-42533") Exploit attributes ("Exploit available" set to "True") Exploit attributes ("Exploitability ease" set to "Exploits are available") Plugin Feed: 202607291516
Version 1.1 Jul 27, 2026, 10:22 AM New Plugin Feed: 202607271022