CVE-2026-91184 NGINX Gateway Fabric - Command Injection

NGINX Gateway Fabric contains a command injection caused by unescaped rendering of spec.basic.realm and spec.jwt.realm fields in AuthenticationFilter CRD, letting authenticated attackers inject arbitrary NGINX directives, exploit requires authenticated access to configure AuthenticationFilter.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Command Injection
Impact
Information Disclosure, Server Side Request Forgery, Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-76

Vendor fix

Update to the latest version with fixed AuthenticationFilter rendering to properly escape realm fields.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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