CVE-2026-40701
NGINX Plus and 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 …
Impact
NGINX Plus and 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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| F5 | Dos | from 4.3.0 through 4.7.0 Version 4.8.0 |
| F5 | Nginx Gateway Fabric | from 1.3.0 through 1.6.2 from 2.0.0 through 2.6.0 |
| F5 | Nginx Ingress Controller | from 3.5.0 through 3.7.2 from 4.0.0 through 4.0.1 from 5.0.0 through 5.4.2 |
| F5 | Nginx Instance Manager | from 2.16.0 through 2.22.0 |
| F5 | Nginx Open Source | from 1.19.0 through 1.30.0 |
| F5 | Nginx Plus | from r32 through r36 |
| F5 | Waf | from 4.9.0 through 4.16.0 from 5.1.0 through 5.8.0 from 5.9.0 through 5.12.1 |