CVE-2026-40701
Description
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.
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| f5 nginx_gateway_fabric | 1.3.0 ≤ v ≤ 1.6.2, 2.0.0 ≤ v ≤ 2.6.0 | — |
| f5 dos | 4.3.0 ≤ v ≤ 4.7.0, 4.8.0 | — |
| f5 nginx_ingress_controller | 3.5.0 ≤ v ≤ 3.7.2, 4.0.0 ≤ v ≤ 4.0.1, 5.0.0 ≤ v ≤ 5.4.2 | — |
| f5 nginx_instance_manager | 2.16.0 ≤ v ≤ 2.22.0 | — |
| f5 nginx_open_source | 1.19.0 ≤ v ≤ 1.30.0 | — |
| f5 nginx_plus | r32 ≤ v ≤ r36 | — |
| f5 waf | 4.9.0 ≤ v ≤ 4.16.0, 5.1.0 ≤ v ≤ 5.8.0, 5.9.0 ≤ v ≤ 5.12.1 | — |
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