FKIE_CVE-2026-44881

Vulnerability from fkie_nvd - Published: 2026-05-28 22:16 - Updated: 2026-07-21 10:10
Severity
9.9 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
Portainer Community Edition is a lightweight service delivery platform for containerized applications that can be used to manage Docker, Swarm, Kubernetes and ACI environments. From 2.33.0 to before 2.33.8, 2.39.2, and 2.41.0, Portainer supports deploying stacks from Git repositories. When a Git-backed stack is created or updated, Portainer clones the repository using go-git v5, which translates Git blob entries with mode 0o120000 (symlink) into real OS symlinks on the host filesystem via os.Symlink. The only entry blocked from becoming a symlink is .gitmodules; every other path is created as a symlink without validation. Portainer's GET /api/stacks/{id}/file endpoint then reads the stack entry point with os.ReadFile, which follows OS symlinks transparently. A repository containing docker-compose.yml as a symlink to an arbitrary filesystem path causes the symlink target's contents to be returned verbatim in the HTTP response. Any authenticated user with rights to create or update a Git-backed stack — the default configuration in Portainer CE — can read arbitrary files accessible to the Portainer process. This vulnerability is fixed in 2.33.8, 2.39.2, and 2.41.0.
References
security-advisories@github.comhttps://github.com/portainer/portainer/security/advisories/GHSA-rpgq-m5fp-32wrExploit, Third Party Advisory
Impacted products
Vendor Product Version
portainer portainer *
portainer portainer *
portainer portainer 2.40.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "portainer",
          "vendor": "portainer",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.33.0, \u003c 2.33.8"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.39.0, \u003c 2.39.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.40.0, \u003c 2.41.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:portainer:portainer:*:*:*:*:community:*:*:*",
              "matchCriteriaId": "4E7FE81D-D489-4034-9DB4-D48E3B6C3CE4",
              "versionEndExcluding": "2.33.8",
              "versionStartIncluding": "2.33.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:portainer:portainer:*:*:*:*:community:*:*:*",
              "matchCriteriaId": "42BB76C6-ADCE-4D73-BAF0-7DBBB707C360",
              "versionEndExcluding": "2.39.2",
              "versionStartIncluding": "2.34.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:portainer:portainer:2.40.0:*:*:*:community:*:*:*",
              "matchCriteriaId": "69F71AFC-F50D-4D10-9918-413D8E841CC2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Portainer Community Edition is a lightweight service delivery platform for containerized applications that can be used to manage Docker, Swarm, Kubernetes and ACI environments. From 2.33.0 to before 2.33.8, 2.39.2, and 2.41.0, Portainer supports deploying stacks from Git repositories. When a Git-backed stack is created or updated, Portainer clones the repository using go-git v5, which translates Git blob entries with mode 0o120000 (symlink) into real OS symlinks on the host filesystem via os.Symlink. The only entry blocked from becoming a symlink is .gitmodules; every other path is created as a symlink without validation. Portainer\u0027s GET /api/stacks/{id}/file endpoint then reads the stack entry point with os.ReadFile, which follows OS symlinks transparently. A repository containing docker-compose.yml as a symlink to an arbitrary filesystem path causes the symlink target\u0027s contents to be returned verbatim in the HTTP response. Any authenticated user with rights to create or update a Git-backed stack \u2014 the default configuration in Portainer CE \u2014 can read arbitrary files accessible to the Portainer process. This vulnerability is fixed in 2.33.8, 2.39.2, and 2.41.0."
    },
    {
      "lang": "es",
      "value": "Portainer Community Edition es una plataforma ligera de entrega de servicios para aplicaciones en contenedores que puede utilizarse para gestionar entornos Docker, Swarm, Kubernetes y ACI. Desde la 2.33.0 hasta antes de la 2.33.8, 2.39.2 y 2.41.0, Portainer soporta el despliegue de stacks desde repositorios Git. Cuando se crea o actualiza un stack respaldado por Git, Portainer clona el repositorio usando go-git v5, que traduce las entradas blob de Git con modo 0o120000 (symlink) en symlinks reales del sistema operativo en el sistema de archivos del host a trav\u00e9s de os.Symlink. La \u00fanica entrada bloqueada para convertirse en un symlink es .gitmodules; cualquier otra ruta se crea como un symlink sin validaci\u00f3n. El endpoint GET /API/stacks/{id}/file de Portainer luego lee el punto de entrada del stack con os.ReadFile, que sigue los symlinks del sistema operativo de forma transparente. Un repositorio que contiene docker-compose.yml como un symlink a una ruta de sistema de archivos arbitraria hace que el contenido del destino del symlink se devuelva textualmente en la respuesta HTTP. Cualquier usuario autenticado con derechos para crear o actualizar un stack respaldado por Git \u2014 la configuraci\u00f3n predeterminada en Portainer CE \u2014 puede leer archivos arbitrarios accesibles al proceso de Portainer. Esta vulnerabilidad est\u00e1 corregida en 2.33.8, 2.39.2 y 2.41.0."
    }
  ],
  "id": "CVE-2026-44881",
  "lastModified": "2026-07-21T10:10:00.103",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.9,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 6.0,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.5,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "HIGH",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-44881",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-29T14:47:30.082612Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-28T22:16:59.247",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/portainer/portainer/security/advisories/GHSA-rpgq-m5fp-32wr"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-59"
        },
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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