REDHAT-BUG-2436738: Medium severity Nginx NGINX OSS vulnerability

Published Feb 4, 2026
·
Updated

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.

Affected Software

2 affected components
Nginx NGINX OSS
Nginx NGINX Plus

Event History

Feb 4, 2026
Data Sourced
via Red Hat·04:01 PM
DescriptionSeverityAffected Software
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Frequently Asked Questions

1

What is the severity of REDHAT-BUG-2436738?

The severity of REDHAT-BUG-2436738 is classified as high due to the potential for man-in-the-middle attacks.

2

How do I fix REDHAT-BUG-2436738?

To fix REDHAT-BUG-2436738, update NGINX OSS or NGINX Plus to the latest patched version available.

3

What types of servers are affected by REDHAT-BUG-2436738?

REDHAT-BUG-2436738 affects NGINX OSS and NGINX Plus when they are configured to proxy to upstream TLS servers.

4

What kind of attack is associated with REDHAT-BUG-2436738?

REDHAT-BUG-2436738 is associated with man-in-the-middle (MITM) attacks that allow attackers to inject plain text data.

5

Who reported REDHAT-BUG-2436738?

REDHAT-BUG-2436738 was reported by Red Hat through their bug tracking system.

Contact

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