Vulnerability-Lookup

CVE-2026-45553 (GCVE-0-2026-45553)

Vulnerability from cvelistv5 – Published: 2026-06-02 15:34 – Updated: 2026-06-03 13:49

Title

NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()

Summary

NiceGUI is a Python-based UI framework. Prior to version 3.12.0, ui.restructured_text() renders reStructuredText server-side with Docutils without disabling file insertion directives. When a NiceGUI application passes attacker-controlled content to ui.restructured_text(), an attacker can use standard Docutils directives (include, csv-table with :file:, raw with :file:) to read local files readable by the NiceGUI server process. Applications that only pass trusted static strings to ui.restructured_text() are not affected. This issue has been patched in version 3.12.0.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-03 13:49 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/zauberzeug/nicegui/security/ad…	x_refsource_CONFIRM
https://github.com/zauberzeug/nicegui/releases/ta…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
zauberzeug	nicegui	Affected: < 3.12.0	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45553",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-03T13:49:17.577124Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-03T13:49:28.209Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "nicegui",
          "vendor": "zauberzeug",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.12.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NiceGUI is a Python-based UI framework. Prior to version 3.12.0, ui.restructured_text() renders reStructuredText server-side with Docutils without disabling file insertion directives. When a NiceGUI application passes attacker-controlled content to ui.restructured_text(), an attacker can use standard Docutils directives (include, csv-table with :file:, raw with :file:) to read local files readable by the NiceGUI server process. Applications that only pass trusted static strings to ui.restructured_text() are not affected. This issue has been patched in version 3.12.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-200",
              "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-02T15:34:39.897Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-jfrm-rx66-g536",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-jfrm-rx66-g536"
        },
        {
          "name": "https://github.com/zauberzeug/nicegui/releases/tag/v3.12.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/zauberzeug/nicegui/releases/tag/v3.12.0"
        }
      ],
      "source": {
        "advisory": "GHSA-jfrm-rx66-g536",
        "discovery": "UNKNOWN"
      },
      "title": "NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-45553",
    "datePublished": "2026-06-02T15:34:39.897Z",
    "dateReserved": "2026-05-12T17:48:47.880Z",
    "dateUpdated": "2026-06-03T13:49:28.209Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-45553",
      "date": "2026-09-27",
      "epss": "0.00432",
      "percentile": "0.35016"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "nicegui",
                "vendor": "zauberzeug",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 3.12.0"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "NiceGUI is a Python-based UI framework. Prior to version 3.12.0, ui.restructured_text() renders reStructuredText server-side with Docutils without disabling file insertion directives. When a NiceGUI application passes attacker-controlled content to ui.restructured_text(), an attacker can use standard Docutils directives (include, csv-table with :file:, raw with :file:) to read local files readable by the NiceGUI server process. Applications that only pass trusted static strings to ui.restructured_text() are not affected. This issue has been patched in version 3.12.0."
          },
          {
            "lang": "es",
            "value": "NiceGUI es un framework de interfaz de usuario (UI) basado en Python. Antes de la versi\u00f3n 3.12.0, ui.restructured_text() renderiza reStructuredText del lado del servidor con Docutils sin deshabilitar las directivas de inserci\u00f3n de archivos. Cuando una aplicaci\u00f3n NiceGUI pasa contenido controlado por el atacante a ui.restructured_text(), un atacante puede usar directivas est\u00e1ndar de Docutils (include, csv-table con :file:, raw con :file:) para leer archivos locales legibles por el proceso del servidor de NiceGUI. Las aplicaciones que solo pasan cadenas est\u00e1ticas confiables a ui.restructured_text() no se ven afectadas. Este problema ha sido parcheado en la versi\u00f3n 3.12.0."
          }
        ],
        "id": "CVE-2026-45553",
        "lastModified": "2026-07-22T19:10:00.120",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-45553",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-03T13:49:17.577124Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-06-02T16:16:41.833",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/zauberzeug/nicegui/releases/tag/v3.12.0"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-jfrm-rx66-g536"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-200"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2026-06-03T16:01:51+00:00",
      "cve": "CVE-2026-45553",
      "id": "CVE-2026-45553",
      "initial_release_date": "2026-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45553.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-45553",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-06-03T13:49:17.577124Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-06-03T13:49:23.396Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "nicegui",
              "vendor": "zauberzeug",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 3.12.0"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "NiceGUI is a Python-based UI framework. Prior to version 3.12.0, ui.restructured_text() renders reStructuredText server-side with Docutils without disabling file insertion directives. When a NiceGUI application passes attacker-controlled content to ui.restructured_text(), an attacker can use standard Docutils directives (include, csv-table with :file:, raw with :file:) to read local files readable by the NiceGUI server process. Applications that only pass trusted static strings to ui.restructured_text() are not affected. This issue has been patched in version 3.12.0."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-200",
                  "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-06-02T15:34:39.897Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-jfrm-rx66-g536",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-jfrm-rx66-g536"
            },
            {
              "name": "https://github.com/zauberzeug/nicegui/releases/tag/v3.12.0",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/zauberzeug/nicegui/releases/tag/v3.12.0"
            }
          ],
          "source": {
            "advisory": "GHSA-jfrm-rx66-g536",
            "discovery": "UNKNOWN"
          },
          "title": "NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-45553",
        "datePublished": "2026-06-02T15:34:39.897Z",
        "dateReserved": "2026-05-12T17:48:47.880Z",
        "dateUpdated": "2026-06-03T13:49:28.209Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-45553

Vulnerability from fkie_nvd - Published: 2026-06-02 16:16 - Updated: 2026-07-22 19:10

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/zauberzeug/nicegui/releases/tag/v3.12.0
	security-advisories@github.com	https://github.com/zauberzeug/nicegui/security/advisories/GHSA-jfrm-rx66-g536

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "nicegui",
          "vendor": "zauberzeug",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.12.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "NiceGUI is a Python-based UI framework. Prior to version 3.12.0, ui.restructured_text() renders reStructuredText server-side with Docutils without disabling file insertion directives. When a NiceGUI application passes attacker-controlled content to ui.restructured_text(), an attacker can use standard Docutils directives (include, csv-table with :file:, raw with :file:) to read local files readable by the NiceGUI server process. Applications that only pass trusted static strings to ui.restructured_text() are not affected. This issue has been patched in version 3.12.0."
    },
    {
      "lang": "es",
      "value": "NiceGUI es un framework de interfaz de usuario (UI) basado en Python. Antes de la versi\u00f3n 3.12.0, ui.restructured_text() renderiza reStructuredText del lado del servidor con Docutils sin deshabilitar las directivas de inserci\u00f3n de archivos. Cuando una aplicaci\u00f3n NiceGUI pasa contenido controlado por el atacante a ui.restructured_text(), un atacante puede usar directivas est\u00e1ndar de Docutils (include, csv-table con :file:, raw con :file:) para leer archivos locales legibles por el proceso del servidor de NiceGUI. Las aplicaciones que solo pasan cadenas est\u00e1ticas confiables a ui.restructured_text() no se ven afectadas. Este problema ha sido parcheado en la versi\u00f3n 3.12.0."
    }
  ],
  "id": "CVE-2026-45553",
  "lastModified": "2026-07-22T19:10:00.120",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-45553",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-03T13:49:17.577124Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-02T16:16:41.833",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zauberzeug/nicegui/releases/tag/v3.12.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-jfrm-rx66-g536"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-JFRM-RX66-G536

Vulnerability from github – Published: 2026-05-18 20:21 – Updated: 2026-06-09 10:58

Summary

NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()

Details

Summary

ui.restructured_text() renders reStructuredText server-side with Docutils without disabling file insertion directives.

When a NiceGUI application passes attacker-controlled content to ui.restructured_text(), an attacker can use standard Docutils directives (include, csv-table with :file:, raw with :file:) to read local files readable by the NiceGUI server process.

Applications that only pass trusted static strings to ui.restructured_text() are not affected.

Details

The affected component is the reStructuredText renderer:

File: nicegui/elements/restructured_text.py
Function: prepare_content()

prepare_content() renders user-supplied reStructuredText through Docutils:

html = publish_parts(
    remove_indentation(content),
    writer_name='html4',
    settings_overrides={'syntax_highlight': 'short'},
)

The Docutils call only sets syntax_highlight. It does not disable file insertion or raw directives, so Docutils processes directives that read local files and embed their contents into the generated HTML before it is returned to the browser. Frontend sanitization cannot prevent this because the file has already been read server-side.

A minimal vulnerable usage pattern is any page that forwards untrusted input into ui.restructured_text(), e.g. content taken from query parameters, form fields, or other user-controlled sources.

Impact

Local file disclosure. An attacker who can supply reStructuredText content can read files accessible to the NiceGUI server process. Depending on deployment, this may expose:

application .env files
database URLs, API tokens, session/storage secrets
OAuth or cloud credentials
Docker or Kubernetes mounted secrets
application source files
logs and other process-readable files

The confirmed impact is confidentiality loss through arbitrary local file read. Applications are only impacted when they pass untrusted or user-controlled reStructuredText into ui.restructured_text().

Recommended fix

Disable unsafe Docutils features in prepare_content():

html = publish_parts(
    remove_indentation(content),
    writer_name='html4',
    settings_overrides={
        'syntax_highlight': 'short',
        'file_insertion_enabled': False,
        'raw_enabled': False,
        '_disable_config': True,
    },
)

This blocks the include, csv-table :file:, and raw :file: directives as well as local docutils.conf overrides.

Severity

7.5 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.11.1"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "nicegui"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.12.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-45553"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-18T20:21:59Z",
    "nvd_published_at": "2026-06-02T16:16:41Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\n`ui.restructured_text()` renders reStructuredText server-side with Docutils without disabling file insertion directives.\n\nWhen a NiceGUI application passes attacker-controlled content to `ui.restructured_text()`, an attacker can use standard Docutils directives (`include`, `csv-table` with `:file:`, `raw` with `:file:`) to read local files readable by the NiceGUI server process.\n\nApplications that only pass trusted static strings to `ui.restructured_text()` are not affected.\n\n### Details\n\nThe affected component is the reStructuredText renderer:\n\n- File: `nicegui/elements/restructured_text.py`\n- Function: `prepare_content()`\n\n`prepare_content()` renders user-supplied reStructuredText through Docutils:\n\n```python\nhtml = publish_parts(\n    remove_indentation(content),\n    writer_name=\u0027html4\u0027,\n    settings_overrides={\u0027syntax_highlight\u0027: \u0027short\u0027},\n)\n```\n\nThe Docutils call only sets `syntax_highlight`. It does not disable file insertion or raw directives, so Docutils processes directives that read local files and embed their contents into the generated HTML before it is returned to the browser. Frontend sanitization cannot prevent this because the file has already been read server-side.\n\nA minimal vulnerable usage pattern is any page that forwards untrusted input into `ui.restructured_text()`, e.g. content taken from query parameters, form fields, or other user-controlled sources.\n\n### Impact\n\nLocal file disclosure. An attacker who can supply reStructuredText content can read files accessible to the NiceGUI server process. Depending on deployment, this may expose:\n\n- application `.env` files\n- database URLs, API tokens, session/storage secrets\n- OAuth or cloud credentials\n- Docker or Kubernetes mounted secrets\n- application source files\n- logs and other process-readable files\n\nThe confirmed impact is confidentiality loss through arbitrary local file read. Applications are only impacted when they pass untrusted or user-controlled reStructuredText into `ui.restructured_text()`.\n\n### Recommended fix\n\nDisable unsafe Docutils features in `prepare_content()`:\n\n```python\nhtml = publish_parts(\n    remove_indentation(content),\n    writer_name=\u0027html4\u0027,\n    settings_overrides={\n        \u0027syntax_highlight\u0027: \u0027short\u0027,\n        \u0027file_insertion_enabled\u0027: False,\n        \u0027raw_enabled\u0027: False,\n        \u0027_disable_config\u0027: True,\n    },\n)\n```\n\nThis blocks the `include`, `csv-table :file:`, and `raw :file:` directives as well as local `docutils.conf` overrides.",
  "id": "GHSA-jfrm-rx66-g536",
  "modified": "2026-06-09T10:58:07Z",
  "published": "2026-05-18T20:21:59Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-jfrm-rx66-g536"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45553"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/zauberzeug/nicegui"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zauberzeug/nicegui/releases/tag/v3.12.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()"
}

PYSEC-2026-2679

Vulnerability from pysec - Published: 2026-07-13 15:19 - Updated: 2026-07-13 16:05

Details

Summary

ui.restructured_text() renders reStructuredText server-side with Docutils without disabling file insertion directives.

Applications that only pass trusted static strings to ui.restructured_text() are not affected.

Details

The affected component is the reStructuredText renderer:

File: nicegui/elements/restructured_text.py
Function: prepare_content()

prepare_content() renders user-supplied reStructuredText through Docutils:

html = publish_parts(
    remove_indentation(content),
    writer_name='html4',
    settings_overrides={'syntax_highlight': 'short'},
)

A minimal vulnerable usage pattern is any page that forwards untrusted input into ui.restructured_text(), e.g. content taken from query parameters, form fields, or other user-controlled sources.

Impact

Local file disclosure. An attacker who can supply reStructuredText content can read files accessible to the NiceGUI server process. Depending on deployment, this may expose:

application .env files
database URLs, API tokens, session/storage secrets
OAuth or cloud credentials
Docker or Kubernetes mounted secrets
application source files
logs and other process-readable files

Recommended fix

Disable unsafe Docutils features in prepare_content():

html = publish_parts(
    remove_indentation(content),
    writer_name='html4',
    settings_overrides={
        'syntax_highlight': 'short',
        'file_insertion_enabled': False,
        'raw_enabled': False,
        '_disable_config': True,
    },
)

This blocks the include, csv-table :file:, and raw :file: directives as well as local docutils.conf overrides.

Severity

7.5 (High)


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

Impacted products

Name	purl
nicegui	pkg:pypi/nicegui

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "nicegui",
        "purl": "pkg:pypi/nicegui"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.12.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.0",
        "0.1.4",
        "0.1.6",
        "0.2.0",
        "0.2.1",
        "0.2.10",
        "0.2.11",
        "0.2.12",
        "0.2.13",
        "0.2.14",
        "0.2.15",
        "0.2.2",
        "0.2.3",
        "0.2.4",
        "0.2.9",
        "0.3.0",
        "0.3.1",
        "0.3.2",
        "0.3.3",
        "0.3.4",
        "0.3.5",
        "0.3.6",
        "0.3.7",
        "0.3.8",
        "0.3.9",
        "0.4.0",
        "0.4.1",
        "0.4.10",
        "0.4.11",
        "0.4.12",
        "0.4.13",
        "0.4.14",
        "0.4.15",
        "0.4.2",
        "0.4.3",
        "0.4.4",
        "0.4.5",
        "0.4.6",
        "0.4.7",
        "0.4.8",
        "0.4.9",
        "0.5.0",
        "0.5.1",
        "0.5.10",
        "0.5.11",
        "0.5.12",
        "0.5.2",
        "0.5.3",
        "0.5.4",
        "0.5.5",
        "0.5.6",
        "0.5.7",
        "0.5.8",
        "0.5.9",
        "0.6.0",
        "0.6.1",
        "0.6.10",
        "0.6.11",
        "0.6.12",
        "0.6.13",
        "0.6.2",
        "0.6.3",
        "0.6.4",
        "0.6.5",
        "0.6.6",
        "0.6.7",
        "0.6.8",
        "0.6.9",
        "0.7.0",
        "0.7.1",
        "0.7.10",
        "0.7.11",
        "0.7.12",
        "0.7.13",
        "0.7.14",
        "0.7.15",
        "0.7.16",
        "0.7.17",
        "0.7.18",
        "0.7.19",
        "0.7.2",
        "0.7.21",
        "0.7.22",
        "0.7.23",
        "0.7.24",
        "0.7.25",
        "0.7.26",
        "0.7.27",
        "0.7.28",
        "0.7.29",
        "0.7.3",
        "0.7.30",
        "0.7.4",
        "0.7.6",
        "0.7.7",
        "0.7.8",
        "0.7.9",
        "0.8.0",
        "0.8.1",
        "0.8.10",
        "0.8.11",
        "0.8.12",
        "0.8.13",
        "0.8.14",
        "0.8.15",
        "0.8.16",
        "0.8.2",
        "0.8.3",
        "0.8.4",
        "0.8.5",
        "0.8.6",
        "0.8.7",
        "0.8.8",
        "0.8.9",
        "0.9.0",
        "0.9.1",
        "0.9.10",
        "0.9.11",
        "0.9.12",
        "0.9.13",
        "0.9.14",
        "0.9.15",
        "0.9.16",
        "0.9.17",
        "0.9.18",
        "0.9.19",
        "0.9.2",
        "0.9.20",
        "0.9.21",
        "0.9.22",
        "0.9.23",
        "0.9.24",
        "0.9.25",
        "0.9.26",
        "0.9.27",
        "0.9.28",
        "0.9.3",
        "0.9.4",
        "0.9.5",
        "0.9.6",
        "0.9.7",
        "0.9.8",
        "0.9.9",
        "1.0.1",
        "1.0.10",
        "1.0.2",
        "1.0.3",
        "1.0.4",
        "1.0.5",
        "1.0.6",
        "1.0.7",
        "1.0.8",
        "1.0.9",
        "1.1.0",
        "1.1.1",
        "1.1.10",
        "1.1.11",
        "1.1.2",
        "1.1.3",
        "1.1.4",
        "1.1.5",
        "1.1.6",
        "1.1.7",
        "1.1.8",
        "1.1.9",
        "1.2.0",
        "1.2.1",
        "1.2.10",
        "1.2.11",
        "1.2.12",
        "1.2.13",
        "1.2.14",
        "1.2.15",
        "1.2.16",
        "1.2.17",
        "1.2.18",
        "1.2.2",
        "1.2.20",
        "1.2.21",
        "1.2.22",
        "1.2.23",
        "1.2.24",
        "1.2.3",
        "1.2.4",
        "1.2.5",
        "1.2.6",
        "1.2.7",
        "1.2.8",
        "1.2.9",
        "1.3.0",
        "1.3.1",
        "1.3.10",
        "1.3.11",
        "1.3.12",
        "1.3.13",
        "1.3.14",
        "1.3.15",
        "1.3.16",
        "1.3.17",
        "1.3.18",
        "1.3.2",
        "1.3.3",
        "1.3.4",
        "1.3.5",
        "1.3.6",
        "1.3.7",
        "1.3.8",
        "1.3.9",
        "1.4.0",
        "1.4.1",
        "1.4.10",
        "1.4.11",
        "1.4.12",
        "1.4.13",
        "1.4.14",
        "1.4.15",
        "1.4.16",
        "1.4.17",
        "1.4.18",
        "1.4.19",
        "1.4.2",
        "1.4.20",
        "1.4.21",
        "1.4.22",
        "1.4.23",
        "1.4.24",
        "1.4.25",
        "1.4.26",
        "1.4.27",
        "1.4.28",
        "1.4.29",
        "1.4.3",
        "1.4.30",
        "1.4.31",
        "1.4.33",
        "1.4.34",
        "1.4.35",
        "1.4.36",
        "1.4.37",
        "1.4.4",
        "1.4.5",
        "1.4.6",
        "1.4.7",
        "1.4.8",
        "1.4.9",
        "2.0.0",
        "2.0.1",
        "2.1.0",
        "2.10.0",
        "2.10.1",
        "2.11.0",
        "2.11.1",
        "2.12.0",
        "2.12.1",
        "2.13.0",
        "2.14.0",
        "2.14.1",
        "2.15.0",
        "2.16.0",
        "2.16.1",
        "2.17.0",
        "2.18.0",
        "2.19.0",
        "2.2.0",
        "2.20.0",
        "2.21.0",
        "2.21.1",
        "2.22.0",
        "2.22.1",
        "2.22.2",
        "2.23.0",
        "2.23.1",
        "2.23.2",
        "2.23.3",
        "2.24.0",
        "2.24.1",
        "2.24.2",
        "2.3.0",
        "2.4.0",
        "2.5.0",
        "2.7.0",
        "2.8.0",
        "2.8.1",
        "2.9.0",
        "2.9.1",
        "3.0.0",
        "3.0.0rc1",
        "3.0.1",
        "3.0.2",
        "3.0.3",
        "3.0.4",
        "3.1.0",
        "3.10.0",
        "3.11.0",
        "3.11.1",
        "3.2.0",
        "3.3.0",
        "3.3.1",
        "3.4.0",
        "3.4.1",
        "3.5.0",
        "3.6.0",
        "3.6.1",
        "3.7.0",
        "3.7.1",
        "3.8.0",
        "3.9.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-45553",
    "GHSA-jfrm-rx66-g536"
  ],
  "details": "### Summary\n\n`ui.restructured_text()` renders reStructuredText server-side with Docutils without disabling file insertion directives.\n\nWhen a NiceGUI application passes attacker-controlled content to `ui.restructured_text()`, an attacker can use standard Docutils directives (`include`, `csv-table` with `:file:`, `raw` with `:file:`) to read local files readable by the NiceGUI server process.\n\nApplications that only pass trusted static strings to `ui.restructured_text()` are not affected.\n\n### Details\n\nThe affected component is the reStructuredText renderer:\n\n- File: `nicegui/elements/restructured_text.py`\n- Function: `prepare_content()`\n\n`prepare_content()` renders user-supplied reStructuredText through Docutils:\n\n```python\nhtml = publish_parts(\n    remove_indentation(content),\n    writer_name=\u0027html4\u0027,\n    settings_overrides={\u0027syntax_highlight\u0027: \u0027short\u0027},\n)\n```\n\nThe Docutils call only sets `syntax_highlight`. It does not disable file insertion or raw directives, so Docutils processes directives that read local files and embed their contents into the generated HTML before it is returned to the browser. Frontend sanitization cannot prevent this because the file has already been read server-side.\n\nA minimal vulnerable usage pattern is any page that forwards untrusted input into `ui.restructured_text()`, e.g. content taken from query parameters, form fields, or other user-controlled sources.\n\n### Impact\n\nLocal file disclosure. An attacker who can supply reStructuredText content can read files accessible to the NiceGUI server process. Depending on deployment, this may expose:\n\n- application `.env` files\n- database URLs, API tokens, session/storage secrets\n- OAuth or cloud credentials\n- Docker or Kubernetes mounted secrets\n- application source files\n- logs and other process-readable files\n\nThe confirmed impact is confidentiality loss through arbitrary local file read. Applications are only impacted when they pass untrusted or user-controlled reStructuredText into `ui.restructured_text()`.\n\n### Recommended fix\n\nDisable unsafe Docutils features in `prepare_content()`:\n\n```python\nhtml = publish_parts(\n    remove_indentation(content),\n    writer_name=\u0027html4\u0027,\n    settings_overrides={\n        \u0027syntax_highlight\u0027: \u0027short\u0027,\n        \u0027file_insertion_enabled\u0027: False,\n        \u0027raw_enabled\u0027: False,\n        \u0027_disable_config\u0027: True,\n    },\n)\n```\n\nThis blocks the `include`, `csv-table :file:`, and `raw :file:` directives as well as local `docutils.conf` overrides.",
  "id": "PYSEC-2026-2679",
  "modified": "2026-07-13T16:05:03.407459Z",
  "published": "2026-07-13T15:19:08.957989Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-jfrm-rx66-g536"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45553"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/zauberzeug/nicegui"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zauberzeug/nicegui/releases/tag/v3.12.0"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/nicegui"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-jfrm-rx66-g536"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-45553 (GCVE-0-2026-45553)

FKIE_CVE-2026-45553

GHSA-JFRM-RX66-G536

Summary

Details

Impact

Recommended fix

PYSEC-2026-2679

Summary

Details

Impact

Recommended fix

Tags

Sightings

Nomenclature

Related by attack behaviour