CVEvulnerability
CVE-2026-40701
6.3 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2026-05-13
- Last modified
- 2026-10-26
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 6.3 MEDIUM — 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
- CVSS 3.1 ([email protected])
- 4.8 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
- Weaknesses
- CWE-416
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.
Affected configurations
• 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)
Related
Weakness · CWE (1)
- CWE-416 Use After Free weakness
References
- https://my.f5.com/manage/s/article/K000161021 Mitigation, Vendor Advisory