FKIE_CVE-2026-32128

Vulnerability from fkie_nvd - Published: 2026-03-11 22:16 - Updated: 2026-03-19 17:38
Severity ?
6.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Summary
FastGPT is an AI Agent building platform. In 4.14.7 and earlier, FastGPT's Python Sandbox (fastgpt-sandbox) includes guardrails intended to prevent file writes (static detection + seccomp). These guardrails are bypassable by remapping stdout (fd 1) to an arbitrary writable file descriptor using fcntl. After remapping, writing via sys.stdout.write() still satisfies the seccomp rule write(fd==1), enabling arbitrary file creation/overwrite inside the sandbox container despite the intended no file writes restriction.
References
security-advisories@github.comhttps://github.com/labring/FastGPT/security/advisories/GHSA-6hw6-mxrm-v6wjVendor Advisory, Exploit, Mitigation
Impacted products
Vendor Product Version
fastgpt fastgpt *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:fastgpt:fastgpt:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "EE37BFC6-6051-4C66-AED8-9F7F80DC3EE6",
              "versionEndIncluding": "4.14.7",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "FastGPT is an AI Agent building platform. In 4.14.7 and earlier, FastGPT\u0027s Python Sandbox (fastgpt-sandbox) includes guardrails intended to prevent file writes (static detection + seccomp). These guardrails are bypassable by remapping stdout (fd 1) to an arbitrary writable file descriptor using fcntl. After remapping, writing via sys.stdout.write() still satisfies the seccomp rule write(fd==1), enabling arbitrary file creation/overwrite inside the sandbox container despite the intended no file writes restriction."
    },
    {
      "lang": "es",
      "value": "FastGPT es una plataforma de creaci\u00f3n de agentes de IA. En 4.14.7 y versiones anteriores, el sandbox de Python de FastGPT (fastgpt-sandbox) incluye barreras de seguridad destinadas a prevenir escrituras de archivos (detecci\u00f3n est\u00e1tica + seccomp). Estas barreras de seguridad son eludibles reasignando stdout (fd 1) a un descriptor de archivo arbitrario con permisos de escritura usando fcntl. Despu\u00e9s de la reasignaci\u00f3n, la escritura a trav\u00e9s de sys.stdout.write() a\u00fan satisface la regla de seccomp write(fd==1), lo que permite la creaci\u00f3n/sobrescritura arbitraria de archivos dentro del contenedor del sandbox a pesar de la restricci\u00f3n intencionada de no escritura de archivos."
    }
  ],
  "id": "CVE-2026-32128",
  "lastModified": "2026-03-19T17:38:40.920",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-03-11T22:16:32.633",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory",
        "Exploit",
        "Mitigation"
      ],
      "url": "https://github.com/labring/FastGPT/security/advisories/GHSA-6hw6-mxrm-v6wj"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-184"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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