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.

Project Subscriptions

Vendors Products
Nginx Gateway Fabric Subscribe
Nginx Ingress Controller Subscribe
Nginx Instance Manager Subscribe
Nginx Open Source Subscribe
Nginx Plus Subscribe
Advisories
Source ID Title
Debian DSA Debian DSA DSA-6131-1 nginx security update
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 13 Feb 2026 21:45:00 +0000

Type Values Removed Values Added
First Time appeared F5 nginx Gateway Fabric
F5 nginx Ingress Controller
F5 nginx Instance Manager
Weaknesses CWE-345
CPEs cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r32:-:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r32:p1:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r32:p2:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r32:p3:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r33:p1:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r33:p2:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r33:p3:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r34:p1:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r34:p2:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r35:-:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:-:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:*:*:*:*
Vendors & Products F5 nginx Gateway Fabric
F5 nginx Ingress Controller
F5 nginx Instance Manager

Thu, 05 Feb 2026 06:30:00 +0000

Type Values Removed Values Added
References

Thu, 05 Feb 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Wed, 04 Feb 2026 21:30:00 +0000

Type Values Removed Values Added
First Time appeared F5
F5 nginx Open Source
F5 nginx Plus
Vendors & Products F5
F5 nginx Open Source
F5 nginx Plus

Wed, 04 Feb 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 04 Feb 2026 15:15:00 +0000

Type Values Removed Values Added
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.
Title NGINX vulnerability
Weaknesses CWE-349
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: f5

Published:

Updated: 2026-02-05T05:25:39.303Z

Reserved: 2026-01-29T18:26:26.996Z

Link: CVE-2026-1642

cve-icon Vulnrichment

Updated: 2026-02-05T05:25:39.303Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-04T15:16:14.190

Modified: 2026-02-13T21:35:01.730

Link: CVE-2026-1642

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-02-04T15:02:06Z

Links: CVE-2026-1642 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-02-04T21:17:45Z

Weaknesses