Vulnerability-Lookup

CVE-2026-108258 (GCVE-0-2026-108258)

Vulnerability from cvelistv5 – Published: 2026-10-09 20:34 – Updated: 2026-10-09 20:34

Title

Shiny for Python - Path traversal in bookmark restore

Summary

Shiny for Python is a framework for building interactive web applications in Python. From 1.4.0 until 1.6.4, bookmark restore accepts a client-supplied state_id and joins it into the server-side shiny_bookmarks directory without validating that it is a single safe path segment. An unauthenticated request can use parent-directory segments or an absolute path to make the server open input.json and values.json outside the bookmark store, even when bookmark_store is set to disable. In applications configured with bookmark_store set to server and using ui.input_file(), the restore handler can additionally copy and expose an attacker-selected file from an attacker-selected directory. This issue is fixed in version 1.6.4.

Severity

6.9 (Medium)


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

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7595 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/posit-dev/py-shiny/security/ad…	x_refsource_CONFIRM
https://github.com/posit-dev/py-shiny/commit/1d8e…	x_refsource_MISC
https://github.com/posit-dev/py-shiny/releases/ta…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
posit-dev	py-shiny	Affected: >= 1.4.0, < 1.6.4	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "py-shiny",
          "vendor": "posit-dev",
          "versions": [
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          "lang": "en",
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        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
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            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
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            "userInteraction": "NONE",
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            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-22",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-09T20:34:39.539Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/posit-dev/py-shiny/security/advisories/GHSA-47c3-hpmg-7j6p",
          "tags": [
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          "url": "https://github.com/posit-dev/py-shiny/security/advisories/GHSA-47c3-hpmg-7j6p"
        },
        {
          "name": "https://github.com/posit-dev/py-shiny/commit/1d8ecb46cbc9621b7dc8812111d26692e086b376",
          "tags": [
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          ],
          "url": "https://github.com/posit-dev/py-shiny/commit/1d8ecb46cbc9621b7dc8812111d26692e086b376"
        },
        {
          "name": "https://github.com/posit-dev/py-shiny/releases/tag/v1.6.4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/posit-dev/py-shiny/releases/tag/v1.6.4"
        }
      ],
      "source": {
        "advisory": "GHSA-47c3-hpmg-7j6p",
        "discovery": "UNKNOWN"
      },
      "title": "Shiny for Python - Path traversal in bookmark restore"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-108258",
    "datePublished": "2026-10-09T20:34:39.539Z",
    "dateReserved": "2026-10-09T17:33:15.409Z",
    "dateUpdated": "2026-10-09T20:34:39.539Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-108258",
      "date": "2026-10-11",
      "epss": "0.00357",
      "percentile": "0.27452"
    },
    "nvd": {
      "cve": {
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            "affectedData": [
              {
                "product": "py-shiny",
                "vendor": "posit-dev",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003e= 1.4.0, \u003c 1.6.4"
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        "descriptions": [
          {
            "lang": "en",
            "value": "Shiny for Python is a framework for building interactive web applications in Python. From 1.4.0 until 1.6.4, bookmark restore accepts a client-supplied state_id and joins it into the server-side shiny_bookmarks directory without validating that it is a single safe path segment. An unauthenticated request can use parent-directory segments or an absolute path to make the server open input.json and values.json outside the bookmark store, even when bookmark_store is set to disable. In applications configured with bookmark_store set to server and using ui.input_file(), the restore handler can additionally copy and expose an attacker-selected file from an attacker-selected directory. This issue is fixed in version 1.6.4."
          }
        ],
        "id": "CVE-2026-108258",
        "lastModified": "2026-10-09T21:17:03.853",
        "metrics": {
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 6.9,
                "baseSeverity": "MEDIUM",
                "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": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/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",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "LOW",
                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-09T21:17:03.853",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/posit-dev/py-shiny/commit/1d8ecb46cbc9621b7dc8812111d26692e086b376"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/posit-dev/py-shiny/releases/tag/v1.6.4"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/posit-dev/py-shiny/security/advisories/GHSA-47c3-hpmg-7j6p"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Received",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-22"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}

FKIE_CVE-2026-108258

Vulnerability from fkie_nvd - Published: 2026-10-09 21:17 - Updated: 2026-10-09 21:17

Severity

6.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/posit-dev/py-shiny/commit/1d8ecb46cbc9621b7dc8812111d26692e086b376
	security-advisories@github.com	https://github.com/posit-dev/py-shiny/releases/tag/v1.6.4
	security-advisories@github.com	https://github.com/posit-dev/py-shiny/security/advisories/GHSA-47c3-hpmg-7j6p

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "py-shiny",
          "vendor": "posit-dev",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.4.0, \u003c 1.6.4"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Shiny for Python is a framework for building interactive web applications in Python. From 1.4.0 until 1.6.4, bookmark restore accepts a client-supplied state_id and joins it into the server-side shiny_bookmarks directory without validating that it is a single safe path segment. An unauthenticated request can use parent-directory segments or an absolute path to make the server open input.json and values.json outside the bookmark store, even when bookmark_store is set to disable. In applications configured with bookmark_store set to server and using ui.input_file(), the restore handler can additionally copy and expose an attacker-selected file from an attacker-selected directory. This issue is fixed in version 1.6.4."
    }
  ],
  "id": "CVE-2026-108258",
  "lastModified": "2026-10-09T21:17:03.853",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.9,
          "baseSeverity": "MEDIUM",
          "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": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-10-09T21:17:03.853",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/posit-dev/py-shiny/commit/1d8ecb46cbc9621b7dc8812111d26692e086b376"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/posit-dev/py-shiny/releases/tag/v1.6.4"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/posit-dev/py-shiny/security/advisories/GHSA-47c3-hpmg-7j6p"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-47C3-HPMG-7J6P

Vulnerability from github – Published: 2026-10-09 20:56 – Updated: 2026-10-09 20:56

Summary

Shiny for Python has path traversal in bookmark restore

Details

Impact

Shiny for Python's bookmark-restore path accepted a client-supplied _state_id_ query-string value and joined it into the server-side bookmark directory (<cwd>/shiny_bookmarks/<id>) without validating it. A value containing .. path segments, or an absolute path, could therefore cause the server to open and parse input.json and values.json from a directory outside the bookmark store.

On a default application the restore was attempted whenever the client supplied a URL query string — including when bookmarking was disabled (bookmark_store="disable") — so no opt-in configuration was required. For such applications the impact is an unauthenticated, server-side probe for the existence and JSON-validity of attacker-chosen paths, constrained to those two file names.

Applications configured with bookmark_store="server" and using ui.input_file() are affected more seriously. The file-input restore handler copies files out of the restore directory, so the contents of an attacker-selected file name within an attacker-selected directory could be read into the application.

Affected versions

1.4.0 through 1.6.3. Bookmarking was introduced in 1.4.0; earlier releases do not contain the affected code path and are not affected.

Patches

Fixed in 1.6.4. Upgrade with:

pip install --upgrade shiny

The fix validates bookmark IDs against an allowlist — a single path segment matching [A-Za-z0-9_-]+, which cannot express a path separator, a .. parent reference, or an absolute path — before the ID is used to build a filesystem path. Bookmark IDs generated by Shiny are unaffected by this restriction. Restore is additionally gated on the application's bookmark_store setting at a single point, so it no longer runs when bookmarking is disabled, and the on-disk restore path is honored only under bookmark_store="server".

Workarounds

There is no configuration change that mitigates this on an affected version: the restore path ran even with bookmark_store="disable". Deployments that cannot upgrade immediately can strip the _state_id_ parameter from incoming query strings at a reverse proxy or load balancer, which prevents the affected code path from being reached.

Credits

Reported by @0xRenSec.

Severity

6.9 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.6.3"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "shiny"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.4.0"
            },
            {
              "fixed": "1.6.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-108258"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-09T20:56:37Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nShiny for Python\u0027s bookmark-restore path accepted a client-supplied `_state_id_`\nquery-string value and joined it into the server-side bookmark directory\n(`\u003ccwd\u003e/shiny_bookmarks/\u003cid\u003e`) without validating it. A value containing `..`\npath segments, or an absolute path, could therefore cause the server to open and\nparse `input.json` and `values.json` from a directory outside the bookmark store.\n\nOn a default application the restore was attempted whenever the client supplied a\nURL query string \u2014 including when bookmarking was disabled\n(`bookmark_store=\"disable\"`) \u2014 so no opt-in configuration was required. For such\napplications the impact is an unauthenticated, server-side probe for the\nexistence and JSON-validity of attacker-chosen paths, constrained to those two\nfile names.\n\nApplications configured with `bookmark_store=\"server\"` **and** using\n`ui.input_file()` are affected more seriously. The file-input restore handler\ncopies files out of the restore directory, so the contents of an\nattacker-selected file name within an attacker-selected directory could be read\ninto the application.\n\n### Affected versions\n\n1.4.0 through 1.6.3. Bookmarking was introduced in 1.4.0; earlier releases do\nnot contain the affected code path and are not affected.\n\n### Patches\n\nFixed in **1.6.4**. Upgrade with:\n\n```\npip install --upgrade shiny\n```\n\nThe fix validates bookmark IDs against an allowlist \u2014 a single path segment\nmatching `[A-Za-z0-9_-]+`, which cannot express a path separator, a `..` parent\nreference, or an absolute path \u2014 before the ID is used to build a filesystem\npath. Bookmark IDs generated by Shiny are unaffected by this restriction.\nRestore is additionally gated on the application\u0027s `bookmark_store` setting at a\nsingle point, so it no longer runs when bookmarking is disabled, and the on-disk\nrestore path is honored only under `bookmark_store=\"server\"`.\n\n### Workarounds\n\nThere is no configuration change that mitigates this on an affected version:\nthe restore path ran even with `bookmark_store=\"disable\"`. Deployments that\ncannot upgrade immediately can strip the `_state_id_` parameter from incoming\nquery strings at a reverse proxy or load balancer, which prevents the affected\ncode path from being reached.\n\n### Credits\n\nReported by [@0xRenSec](https://github.com/0xRenSec).",
  "id": "GHSA-47c3-hpmg-7j6p",
  "modified": "2026-10-09T20:56:37Z",
  "published": "2026-10-09T20:56:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/posit-dev/py-shiny/security/advisories/GHSA-47c3-hpmg-7j6p"
    },
    {
      "type": "WEB",
      "url": "https://github.com/posit-dev/py-shiny/commit/1d8ecb46cbc9621b7dc8812111d26692e086b376"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/posit-dev/py-shiny"
    },
    {
      "type": "WEB",
      "url": "https://github.com/posit-dev/py-shiny/releases/tag/v1.6.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Shiny for Python has path traversal in bookmark restore"
}

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-2026-108258 (GCVE-0-2026-108258)

FKIE_CVE-2026-108258

GHSA-47C3-HPMG-7J6P

Impact

Affected versions

Patches

Workarounds

Credits

Tags

Sightings

Nomenclature

Related by attack behaviour