CVE-2026-91184— NGINX Gateway Fabric vulnerability
Quick assessment
Affected
F5 NGINX Gateway Fabric
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Description NGINX Gateway Fabric has a vulnerability when it renders the spec.basic.realm (and spec.jwt.realm) field of a namespaced AuthenticationFilter verbatim, unescaped and unvalidated, into the shared data-plane nginx.conf as auth_basic "<realm>";. A nam
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| F5 | NGINX Gateway Fabric | 2.4.0< 2.8.0 |
affected |
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I. Basic Information for CVE-2026-91184
Vulnerability Information
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Vulnerability Title
NGINX Gateway Fabric vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Description
NGINX Gateway Fabric has a vulnerability when it renders the spec.basic.realm (and spec.jwt.realm) field of a namespaced AuthenticationFilter verbatim, unescaped and unvalidated, into the shared data-plane nginx.conf as auth_basic "<realm>";. A namespaced authenticated attacker that configures AuthenticationFilter CRD to an HTTPRoute/GRPCRoute on a shared Gateway can craft a realm value that closes the quoted directive and the enclosing location {} block and injects arbitrary NGINX directives into that Gateway's data-plane config.
Impact
A remote authenticated attacker can send crafted requests to configure NGINX Gateway Fabric AuthenticationFilter CRD and may be able to read every co-located tenant's mounted secrets, SSRF via proxy_pass, reading the pod ServiceAccount token, or hijacking other tenants' routes. There is no data plane exposure; this is a control plane issue only.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
等价特殊元素的转义处理不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| F5 | NGINX Gateway Fabric | 2.4.0 ~ 2.8.0 | - |
|
II. Public POCs for CVE-2026-91184
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-91184 (1)
-
NGINX Gateway Fabric vulnerability CVE-2026-91184 vendor-advisory
Same Patch Batch · F5 · 2026-10-14 · 11 CVEs total
| CVE-2026-93479 | 8.1 HIGH | NGINX map directive and regex matching vulnerability |
| CVE-2026-15176 | 8.1 HIGH | NGINX ngx_http_core_module vulnerability |
| CVE-2026-97205 | 8.1 HIGH | NGINX ngx_http_core_module vulnerability |
| CVE-2026-94197 | 7.5 HIGH | NGINX Ingress Controller vulnerability |
| CVE-2026-104939 | 7.5 HIGH | NGINX Ingress Controller vulnerability |
| CVE-2026-101019 | 6.5 MEDIUM | NGINX ngx_http_js_module vulnerability |
| CVE-2026-96615 | 6.5 MEDIUM | NGINX Gateway Fabric vulnerability |
| CVE-2026-97629 | 6.5 MEDIUM | NGINX ngx_http_ssl_module vulnerability |
| CVE-2026-95101 | 5.3 MEDIUM | NGINX ngx_http_v3_module vulnerability |
| CVE-2026-101025 | 5.3 MEDIUM | NGINX ngx_http_js_module vulnerability |
IV. Related Vulnerabilities
V. Comments for CVE-2026-91184
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