Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

Go to Calendar     Go to Press Room     Go to Newsletters subscription

Search

CVE-2026-1642

Severity CVSS v4.0:
HIGH
Type:
Unavailable / Other
Publication date:
04/02/2026
Last modified:
13/02/2026

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.

Impact

Vector 4.0
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 CVSS v4.0 Severity and Metrics:

Base Score: 8.20 HIGH
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

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): Present
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality (VC): None
Integrity (VI): High
Availability (VA): None
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None

Base Score 4.0
8.20
Severity 4.0
HIGH
Vector 3.x
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS v3.1 Severity and Metrics:

Base Score: 5.90 MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): High
Availability (A): None

Base Score 3.x
5.90
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* 1.2.0 (including) 1.6.2 (including)
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* 2.0.0 (including) 2.4.1 (excluding)
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* 3.4.0 (including) 3.7.2 (including)
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* 4.0.0 (including) 4.0.1 (including)
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* 5.0.0 (including) 5.3.3 (excluding)
cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:* 2.15.1 (including) 2.21.0 (including)
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* 1.3.0 (including) 1.28.2 (excluding)
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* 1.29.0 (including) 1.29.5 (excluding)
cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:* r33 (including) r35 (excluding)
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:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools