CVE-2026-1642

HIGH EPSS 25.8%
Published Feb 4, 20264mo ago · Modified Jun 17, 20261w ago
8.2 CVSS 4.0
High
Find Similar
Published Feb 4, 2026 4mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
8.2
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
25.8% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 2

CWE-345
CWE-349

Affected Products 21

VendorProductVersionRange
f5nginx_gateway_fabric*≥1.2.0  –  ≤1.6.2
f5nginx_gateway_fabric*≥2.0.0  –  <2.4.1
f5nginx_ingress_controller*≥3.4.0  –  ≤3.7.2
f5nginx_ingress_controller*≥4.0.0  –  ≤4.0.1
f5nginx_ingress_controller*≥5.0.0  –  <5.3.3
f5nginx_instance_manager*≥2.15.1  –  ≤2.21.0
f5nginx_open_source*≥1.3.0  –  <1.28.2
f5nginx_open_source*≥1.29.0  –  <1.29.5
f5nginx_plus*≥r33  –  <r35
f5nginx_plusr32any
f5nginx_plusr32any
f5nginx_plusr32any
f5nginx_plusr32any
f5nginx_plusr33any
f5nginx_plusr33any
f5nginx_plusr33any
f5nginx_plusr34any
f5nginx_plusr34any
f5nginx_plusr35any
f5nginx_plusr36any
f5nginx_plusr36any

References 2

  • openwall.com http://www.openwall.com/lists/oss-security/2026/02/05/1
    Mailing ListThird Party Advisory
  • my.f5.com https://my.f5.com/manage/s/article/K000159824
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.