Skip to content
fr Sign in
8.8 High

CVE-2026-91184 Description NGINX Gateway Fabric has a vulnerability when it renders the spec.basic.realm (and spec.jwt.realm) field…

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.

Affected products and versions

Product Affected versions Fixed in
NGINX Gateway Fabric 2.4 2.4.0 → < 2.8.0 2.8.0

References

Timeline

  1. Published
  2. Last modified

Other CVEs of NGINX Gateway Fabric

The 6 CVEs of NGINX Gateway Fabric →
CVE-2026-96615 Description NGINX Gateway Fabric has a vulnerability when it is configured with Gateway Custom Resource Definition… 6.5 Medium CVE-2026-66362 Description: When NGINX Plus is configured as the data plane for NGINX Gateway Fabric, an injection vulnerability exists… 8.1 High CVE-2026-32682 When NGINX Gateway Fabric is configured using GRPCRoutes, an authenticated, remote attacker with permission to create or… 6.5 Medium CVE-2026-50107 When NGINX Plus or NGINX Open Source is configured as the data plane for NGINX Gateway Fabric, an injection… 8.1 High
Track this CVE