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Nginx Gateway Fabric CVE-2026-1642

MEDIUM
Acceptance of Extraneous Untrusted Data With Trusted Data (CWE-349)
2026-02-04 f5sirt@f5.com
Nginx Red Hat Nginx Gateway Fabric Nginx Ingress Controller Nginx Instance Manager Nginx Open Source Nginx Plus Suse F5
5.9
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
SUSE
MEDIUM
qualitative
Red Hat
5.9 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

3
Patch released
Apr 09, 2026 - 14:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Feb 04, 2026 - 15:16 nvd
MEDIUM 5.9

DescriptionCVE.org

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.

AnalysisAI

NGINX proxy configurations forwarding traffic to upstream TLS servers can be exploited by network-positioned attackers to inject unencrypted data into proxied responses, potentially compromising data integrity. This vulnerability affects NGINX OSS, NGINX Plus, and related products when specific upstream server conditions are present. No patch is currently available for this medium-severity issue.

Technical ContextAI

Affects Nginx Gateway Fabric. 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.

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Fixed

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CVE-2026-1642 vulnerability details – vuln.today
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