CVE-2026-40701
MEDIUM EPSS 47.7%
Published May 13, 20261mo ago · Modified Jun 23, 20261w ago
6.3 CVSS 4.0
Published May 13, 2026 1mo ago
Last Modified Jun 23, 2026 1w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
47.7% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-416 Use After Free Memory Safety
Affected Products 13
| Vendor | Product | Version | Range |
|---|---|---|---|
| f5 | dos | * | ≥4.3.0 – ≤4.7.0 |
| f5 | dos | 4.8.0 | any |
| 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 1
- my.f5.com https://my.f5.com/manage/s/article/K000161021
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.