NGINX Gateway Fabric configuration directive injection via CRD fields
CVE-2026-11311 is a high-severity injection vulnerability in the NGINX configuration generator component of NGINX Gateway Fabric when NGINX Plus is configured as the data plane. The flaw arises because user-controlled string values from the NginxProxy Custom Resource Definition (CRD) serverTokens field and the AuthenticationFilter CRD extraAuthArgs field are rendered directly into generated NGINX configuration templates without proper sanitization or escaping. An authenticated attacker with permission to create or modify these CRDs can supply crafted values that inject arbitrary NGINX configuration directives into the generated configuration. The issue is described as a control-plane vulnerability; the trigger is through management-plane configuration rather than direct data-plane request handling.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
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A high-severity configuration injection vulnerability in NGINX Gateway Fabric caused by insufficient validation of CRD fields related to OIDC extra arguments and server-token handling, allowing authenticated users with CRD modification rights to inject arbitrary NGINX directives.
A high-severity authenticated configuration-injection vulnerability in NGINX Gateway Fabric caused by insufficient CRD validation, allowing arbitrary NGINX directive injection.
A high-severity vulnerability in NGINX Gateway Fabric that could allow authenticated attackers to inject arbitrary NGINX configuration directives.
A high-severity vulnerability in NGINX Gateway Fabric that could lead to service instability or unauthorized behavior in Kubernetes-based environments.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.