CVE-2026-40701
MEDIUM
MEDIUM
Priority: 0.04
BB Relevance:
73/100
Published: 2026-05-13
Modified: 2026-10-26
First seen: 2026-10-29
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
X
AT:
Present
VC:
Low
VI:
None
VA:
Low
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.
Weakness Classification (1)
Affected Software (13)
| Vendor | Product | Version |
|---|---|---|
| f5 | dos | 4.3.0 – 4.7.0 |
| f5 | dos | 4.8.0 |
| f5 | nginx_gateway_fabric | 1.3.0 – 1.6.2 |
| f5 | nginx_gateway_fabric | 2.0.0 – 2.6.0 |
| f5 | nginx_ingress_controller | 3.5.0 – 3.7.2 |
| f5 | nginx_ingress_controller | 4.0.0 – 4.0.1 |
| f5 | nginx_ingress_controller | 5.0.0 – 5.4.2 |
| f5 | nginx_instance_manager | 2.16.0 – 2.22.0 |
| f5 | nginx_open_source | 1.19.0 – 1.30.0 |
| f5 | nginx_plus | r32 – r36 |
| f5 | waf | 4.9.0 – 4.16.0 |
| f5 | waf | 5.1.0 – 5.8.0 |
| f5 | waf | 5.9.0 – 5.12.1 |
References & Advisories (1)
Mitigation
Vendor Advisory