CVE-2026-1642
5.9 · MEDIUMOverview
CVE-2026-1642 is a medium-severity vulnerability affecting f5 nginx_gateway_fabric. It was published on February 4, 2026 and has a CVSS 3.1 base score of 5.9 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
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.
Remediation
Check the references section for vendor advisories and patches from f5. Update nginx_gateway_fabric to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| f5 | nginx_gateway_fabric | 1.2.0 | Affected |
| f5 | nginx_ingress_controller | 3.4.0 | Affected |
| f5 | nginx_instance_manager | 2.15.1 | Affected |
| f5 | nginx_open_source | >= 1.3.0, < 1.28.2 | Affected |
| f5 | nginx_plus | >= r33, < r35 | Affected |
Frequently Asked Questions
What is CVE-2026-1642?
CVE-2026-1642 is a medium-severity vulnerability affecting f5 nginx_gateway_fabric. It was published on February 4, 2026 and has a CVSS 3.1 base score of 5.9 (MEDIUM).
How severe is CVE-2026-1642?
This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-1642?
Check the references section for vendor advisories and patches from f5. Update nginx_gateway_fabric to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-1642?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-1642 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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