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 Metrics
- 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/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
- Complexity
- low
- Privileges
- none
- User Action
- none
- Confidentiality
- undefined
- Integrity
- undefined
- Availability
- undefined
- Weaknesses
- CWE-349CWE-345
Metadata
- Primary Vendor
- F5
- Published
- 2/4/2026
- Last Modified
- 2/13/2026
- Source
- NIST NVD
- Note: Verify all details with official vendor sources before applying patches.
Affected Products
f5 : nginx_gateway_fabricf5 : nginx_gateway_fabricf5 : nginx_ingress_controllerf5 : nginx_ingress_controllerf5 : nginx_ingress_controllerf5 : nginx_instance_managerf5 : nginx_open_sourcef5 : nginx_open_sourcef5 : nginx_plusf5 : nginx_plusf5 : nginx_plusf5 : nginx_plusf5 : nginx_plusf5 : nginx_plusf5 : nginx_plusf5 : nginx_plusf5 : nginx_plusf5 : nginx_plusf5 : nginx_plusf5 : nginx_plusf5 : nginx_plus
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