CVE-2026-55723— NGINX Ingress Controller vulnerability
Quick assessment
Affected
F5 NGINX Ingress Controller
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.
F5 nginx ingress controller是美国F5公司开源的一个入口流量控制器。 F5 NGINX Ingress Controller 5.0.0版本至5.5.2之前版本以及2026-lts-r1版本至2026-lts-r3之前版本存在输入验证错误漏洞，该漏洞源于配置生成器在将用户可控字段写入NGINX配置时未进行清理，可能导致经过身份验证的攻击者注入任意NGINX配置指令、创建或删除文件或禁用服务。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| F5 | NGINX Ingress Controller | 5.0.0< 5.5.2 |
affected |
2026-lts-r1< 2026-lts-r3 |
affected |
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I. Basic Information for CVE-2026-55723
Vulnerability Information
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Vulnerability Title
NGINX Ingress Controller vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
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:L
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
Vulnerability Title
F5 NGINX Ingress Controller 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F5 nginx ingress controller是美国F5公司开源的一个入口流量控制器。 F5 NGINX Ingress Controller 5.0.0版本至5.5.2之前版本以及2026-lts-r1版本至2026-lts-r3之前版本存在输入验证错误漏洞，该漏洞源于配置生成器在将用户可控字段写入NGINX配置时未进行清理，可能导致经过身份验证的攻击者注入任意NGINX配置指令、创建或删除文件或禁用服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| F5 | NGINX Ingress Controller | 5.0.0 ~ 5.5.2 | - |
|
II. Public POCs for CVE-2026-55723
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-55723 (1)
Same Patch Batch · F5 · 2026-07-15 · 8 CVEs total
| CVE-2026-60005 | 8.2 HIGH | NGINX ngx_http_slice_module vulnerability |
| CVE-2026-42533 | 8.1 HIGH | NGINX Map directive and Regex matching vulnerability |
| CVE-2026-59762 | 7.5 HIGH | BIG-IP HTTP/2 vulnerability |
| CVE-2026-52865 | 6.5 MEDIUM | NGINX Ingress Controller vulnerability |
| CVE-2026-56434 | 6.5 MEDIUM | NGINX ngx_http_ssi_module vulnerability |
| CVE-2026-60062 | 6.4 MEDIUM | NGINX Agent Vulnerability |
| CVE-2026-60065 | 3.7 LOW | NGINX Plus ngx_stream_mqtt_filter_module vulnerability |
IV. Related Vulnerabilities
Same product: NGINX Ingress Controller
V. Comments for CVE-2026-55723
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