CVE-2026-56434
EUVD-2026-4468415.07.2026, 15:16
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. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.Enginsight
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
| Vendor | Product | Version | Source |
|---|---|---|---|
| f5 | nginx_plus | 37.0.0.1 ≤ 𝑥 < 37.0.3.1 | CNA |
| f5 | nginx_plus | 1.31.2 ≤ 𝑥 < 1.31.3 | CNA |
| f5 | nginx_plus | 0.8.11 ≤ 𝑥 < 1.30.4 | CNA |
Common Weakness Enumeration