CVE-2026-40701 — NGINX ngx_http_ssl_module vulnerability

Description (CNA)

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 (CNA)

Vendor / product	Versions
F5 / NGINX Plus	unaffected R37 before *; affected R36 before R36 P4; affected R32 before R32 P6
F5 / NGINX Open Source	unaffected 1.31.0 before *; affected 1.19.0 before 1.30.1

CWE

CWE-416

References

https://my.f5.com/manage/s/article/K000161021

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.