FKIE_CVE-2026-23742

Vulnerability from fkie_nvd - Published: 2026-01-16 20:15 - Updated: 2026-02-18 16:28
Severity ?
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
Skipper is an HTTP router and reverse proxy for service composition. The default skipper configuration before 0.23.0 was -lua-sources=inline,file. The problem starts if untrusted users can create lua filters, because of -lua-sources=inline , for example through a Kubernetes Ingress resource. The configuration inline allows these user to create a script that is able to read the filesystem accessible to the skipper process and if the user has access to read the logs, they an read skipper secrets. This vulnerability is fixed in 0.23.0.
References
security-advisories@github.comhttps://github.com/zalando/skipper/commit/0b52894570773b29e2f3c571b94b4211ef8fa714Patch
security-advisories@github.comhttps://github.com/zalando/skipper/releases/tag/v0.23.0Product, Release Notes
security-advisories@github.comhttps://github.com/zalando/skipper/security/advisories/GHSA-cc8m-98fm-rc9gExploit, Vendor Advisory, Mitigation
Impacted products
Vendor Product Version
zalando skipper *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:zalando:skipper:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B0D14C02-AFA2-4DFF-BFE2-65B34B7B0F81",
              "versionEndExcluding": "0.23.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Skipper is an HTTP router and reverse proxy for service composition. The default skipper configuration before 0.23.0 was -lua-sources=inline,file. The problem starts if untrusted users can create lua filters, because of -lua-sources=inline , for example through a Kubernetes Ingress resource. The configuration inline allows these user to create a script that is able to read the filesystem accessible to the skipper process and if the user has access to read the logs, they an read skipper secrets. This vulnerability is fixed in 0.23.0."
    },
    {
      "lang": "es",
      "value": "Skipper es un router HTTP y proxy inverso para composici\u00f3n de servicios. La configuraci\u00f3n predeterminada de Skipper antes de la versi\u00f3n 0.23.0 era -lua-sources=inline,file. El problema comienza si usuarios no confiables pueden crear filtros Lua, debido a -lua-sources=inline, por ejemplo, a trav\u00e9s de un recurso Ingress de Kubernetes. La configuraci\u00f3n inline permite a estos usuarios crear un script que es capaz de leer el sistema de archivos accesible al proceso de Skipper y, si el usuario tiene acceso para leer los registros, puede leer los secretos de Skipper. Esta vulnerabilidad se corrige en la versi\u00f3n 0.23.0."
    }
  ],
  "id": "CVE-2026-23742",
  "lastModified": "2026-02-18T16:28:20.980",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-01-16T20:15:51.613",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/zalando/skipper/commit/0b52894570773b29e2f3c571b94b4211ef8fa714"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/zalando/skipper/releases/tag/v0.23.0"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory",
        "Mitigation"
      ],
      "url": "https://github.com/zalando/skipper/security/advisories/GHSA-cc8m-98fm-rc9g"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        },
        {
          "lang": "en",
          "value": "CWE-250"
        },
        {
          "lang": "en",
          "value": "CWE-522"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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