Vulnerability-Lookup

GHSA-9566-3H6W-56PP

Vulnerability from github – Published: 2026-06-17 18:35 – Updated: 2026-06-17 18:35

Details

When NGINX Plus is configured as the data plane for NGINX Gateway Fabric, an injection vulnerability exists in the NGINX configuration generator component of NGINX Gateway Fabric. User-supplied string values from the NginxProxy Custom Resource Definition serverTokens field and the AuthenticationFilter Custom Resource Definition extraAuthArgs field are rendered directly into NGINX configuration templates without sanitization or escaping. An authenticated attacker with permission to create or modify these Custom Resource Definitions may craft values that inject arbitrary NGINX configuration directives. This is a control plane issue; there is no data plane exposure from the vulnerability trigger itself.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Severity

8.1 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

8.6 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-11311"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-76"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-17T15:16:42Z",
    "severity": "HIGH"
  },
  "details": "When NGINX Plus is configured as the data plane for NGINX Gateway Fabric, an injection vulnerability exists in the NGINX configuration generator component of NGINX Gateway Fabric. User-supplied string values from the NginxProxy\u00a0Custom Resource Definition serverTokens\u00a0field and the AuthenticationFilter\u00a0Custom Resource Definition extraAuthArgs\u00a0field are rendered directly into NGINX configuration templates without sanitization or escaping. An authenticated attacker with permission to create or modify these Custom Resource Definitions may craft values that inject arbitrary NGINX configuration directives. This is a control plane issue; there is no data plane exposure from the vulnerability trigger itself. \n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
  "id": "GHSA-9566-3h6w-56pp",
  "modified": "2026-06-17T18:35:55Z",
  "published": "2026-06-17T18:35:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11311"
    },
    {
      "type": "WEB",
      "url": "https://my.f5.com/manage/s/article/K000161611"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-11311 (GCVE-0-2026-11311)

Vulnerability from cvelistv5 – Published: 2026-06-17 14:04 – Updated: 2026-06-17 15:42 X_F5

Title

NGINX Gateway Fabric vulnerability

Summary

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

8.6 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-76 - Improper Neutralization of Equvalent Special Elements

Assigner

References

1 reference

URL	Tags
https://my.f5.com/manage/s/article/K000161611	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
F5	NGINX Gateway Fabric	Affected: 2.5.0 , < 2.6.4 (custom)

Date Public

2026-06-17 14:00

Credits

Show details on NVD website

JSON

To clipboard

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        "metrics": [
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                "id": "CVE-2026-11311",
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                  },
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-17T15:42:03.715663Z",
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          ],
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          "versions": [
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              "value": "\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eWhen NGINX Plus is configured as the data plane for NGINX Gateway Fabric, an injection vulnerability exists in the NGINX configuration generator component of NGINX Gateway Fabric. User-supplied string values from the \u003c/span\u003e\u003cstrong\u003eNginxProxy\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;Custom Resource Definition \u003c/span\u003e\u003cstrong\u003eserverTokens\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;field and the \u003c/span\u003e\u003cstrong\u003eAuthenticationFilter\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;Custom Resource Definition \u003c/span\u003e\u003cstrong\u003eextraAuthArgs\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;field are rendered directly into NGINX configuration templates without sanitization or escaping. An authenticated attacker with permission to create or modify these Custom Resource Definitions may craft values that inject arbitrary NGINX configuration directives. This is a control plane issue; there is no data plane exposure from the vulnerability trigger itself.\u003c/span\u003e \n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
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            "valueDensity": "NOT_DEFINED",
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        "discovery": "INTERNAL"
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      "title": "NGINX Gateway Fabric vulnerability",
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    "dateReserved": "2026-06-04T18:01:54.825Z",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-9566-3H6W-56PP

CVE-2026-11311 (GCVE-0-2026-11311)

Tags

Sightings

Nomenclature