CVE-2026-1642
Unknown
Unknown - Not Provided
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
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.
CVSS Scores
EPSS Scores
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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
KEV
| CWE ID | Description |
|---|---|
| CWE-345 | The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. |
| 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. |
