CVE-2026-1642
A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side—along with conditions beyond the attacker's control—may be able to inject plain text data into the response from an upstream proxied server. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
- Score
- CVSS 4.0 8.2 High
- Status
- Analyzed - f5sirt@f5.com
- Published
- 2026-02-04
- Last modified
- 2026-02-05
- Weaknesses
- CWE-345, CWE-349
Affected products
- Nginx Gateway Fabric (F5)
- Nginx Ingress Controller (F5)
- Nginx Instance Manager (F5)
- Nginx Open Source (F5)
- Nginx Plus (F5)
References
- https://my.f5.com/manage/s/article/K000159824
- http://www.openwall.com/lists/oss-security/2026/02/05/1
