CVE-2026-1642
TLS Proxy Injection Vulnerability in NGINX OSS and Plus
Publication date: 2026-02-04
Last updated on: 2026-02-13
Assigner: F5 Networks
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| f5 | nginx_plus | r32 |
| f5 | nginx_plus | r32 |
| f5 | nginx_plus | r32 |
| f5 | nginx_plus | r33 |
| f5 | nginx_plus | r33 |
| f5 | nginx_plus | r34 |
| f5 | nginx_gateway_fabric | From 1.2.0 (inc) to 1.6.2 (inc) |
| f5 | nginx_ingress_controller | From 3.4.0 (inc) to 3.7.2 (inc) |
| f5 | nginx_ingress_controller | From 4.0.0 (inc) to 4.0.1 (inc) |
| f5 | nginx_instance_manager | From 2.15.1 (inc) to 2.21.0 (inc) |
| f5 | nginx_open_source | From 1.29.0 (inc) to 1.29.5 (exc) |
| f5 | nginx_open_source | From 1.3.0 (inc) to 1.28.2 (exc) |
| f5 | nginx_plus | r32 |
| f5 | nginx_plus | r33 |
| f5 | nginx_plus | r34 |
| f5 | nginx_plus | r35 |
| f5 | nginx_plus | r36 |
| f5 | nginx_plus | r36 |
| f5 | nginx_gateway_fabric | From 2.0.0 (inc) to 2.4.1 (exc) |
| f5 | nginx_ingress_controller | From 5.0.0 (inc) to 5.3.3 (exc) |
| f5 | nginx_plus | From r33 (inc) to r35 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-349 | The product, when processing trusted data, accepts any untrusted data that is also included with the trusted data, treating the untrusted data as if it were trusted. |
| CWE-345 | The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in NGINX OSS and NGINX Plus when they are configured to proxy to upstream Transport Layer Security (TLS) servers.
An attacker who is in a man-in-the-middle (MITM) position on the upstream server side, and under certain conditions beyond the attacker's control, may be able to inject plain text data into the response from the upstream proxied server.
How can this vulnerability impact me? :
The vulnerability can allow an attacker positioned as a man-in-the-middle on the upstream server side to inject plain text data into responses from the proxied server.
This could lead to integrity issues where the data received by clients is altered without their knowledge.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know