CVE-2026-55723 NGINX Ingress Controller vulnerability
Authenticated attackers can inject arbitrary NGINX directives via unsanitized CRDs or annotations, potentially executing code or modifying files.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-55723?
CVE-2026-55723 is a high-severity code injection vulnerability in F5 NGINX Ingress Controller, published on 15 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
When NGINX Ingress Controller is configured with Custom Resource Definitions (CRDs) or Ingress annotations, an injection vulnerability exists in the configuration generator of NGINX Ingress Controller. Multiple user-controllable fields are written into the generated NGINX configuration without sanitization. An authenticated attacker with permission to create or modify these CRDs or annotations may craft values that inject arbitrary NGINX configuration directives.
Impact: An authenticated attacker granted write access to NGINX Ingress Controller CRDs or Ingress annotations through the Kubernetes API may be able to inject arbitrary NGINX configuration directives, create or delete files, or disable services. 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.
Weakness: CWE-76
Which versions are affected by CVE-2026-55723?
It affects 1 product.
Products include F5 Nginx Ingress Controller.
How do I fix CVE-2026-55723?
No fix has been published for CVE-2026-55723 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-55723 being exploited?
There is no known exploitation of CVE-2026-55723 in the wild and no public exploit code.
Other vulnerabilities in F5 NGINX Ingress Controller
- CVE-2025-14727 NGINX Ingress Controller vulnerability
- CVE-2026-52865 NGINX Ingress Controller vulnerability
- CVE-2022-41743 NGINX ngx_http_hls_module vulnerability CVE-2022-41743
- CVE-2022-30535 NGINX Ingress Controller vulnerability CVE-2022-30535
- CVE-2021-23055 Security feature bypass in NGINX Ingress Controller
Sources
Also known as GHSA-wxxq-mwhh-cvm2.