CVE-2026-1642

MEDIUM

5.9

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.

CVE Details

CVSS v3.1 Score5.9

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published2/4/2026

Last Modified2/13/2026

Sourcenvd

Honeypot Sightings0

Affected Products

f5:nginx_gateway_fabricf5:nginx_ingress_controllerf5:nginx_instance_managerf5:nginx_open_sourcef5:nginx_plus

Weaknesses (CWE)

CWE-349CWE-345

References

https://my.f5.com/manage/s/article/K000159824(f5sirt@f5.com)

http://www.openwall.com/lists/oss-security/2026/02/05/1(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.