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CVE-2026-1642

NGINX vulnerability

Published: Feb 4, 2026Updated: Feb 13, 2026 Sources: CVE List NVD BDUCWE-349
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
0.3%
Top 75.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-349CWE-345

Affected Products

АЛЬТ СП 10АО «ИВК»
On-premOS
Operating Systems / linux-distro
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
NGINX PlusNGINX Inc.Networking Infrastructure
NGINX Open SourceNGINX Inc.Networking Infrastructure
NGINX Ingress ControllerNGINX Inc.Networking Infrastructure
ао «ивк»commercialRUOperating Systemsaka ivk
ооо «ред софт»commercialRUOperating Systemsaka red soft
nginx inc.commercialUSNetworking Infrastructureaka nginx, nginx plus, njs
and 11 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://nvd.nist.gov/vuln/detail/CVE-2026-1642
nvd.nist.gov
http://www.openwall.com/lists/oss-security/2026/02/05/1
openwall.com
https://my.f5.com/manage/s/article/K000159824
my.f5.com
and 4 more references View all →

Timeline

Published
Feb 4, 2026
Last Updated
Feb 13, 2026

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