Deno is a JavaScript, TypeScript, and WebAssembly runtime. In versions prior to 2.5.3 and 2.2.15, `Deno.FsFile.prototype.utime` and `Deno.FsFile.prototype.utimeSync` are not limited by the permission model check `--deny-write=./`. It's possible to change to change the access (`atime`) and modification (`mtime`) times on the file stream resource even when the file is opened with `read` only permission (and `write`: `false`) and file write operations are not allowed (the script is executed with `--deny-write=./`). Similar APIs like `Deno.utime` and `Deno.utimeSync` require `allow-write` permission, however, when a file is opened, even with read only flags and deny-write permission, it's still possible to change the access (`atime`) and modification (`mtime`) times, and thus bypass the permission model. Versions 2.5.3 and 2.2.15 fix the issue.
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Affected Vendors & Products
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History
Thu, 16 Oct 2025 18:15:00 +0000
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| CPEs | cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:* | |
| Metrics |
cvssV3_1
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Wed, 08 Oct 2025 19:15:00 +0000
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ssvc
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Wed, 08 Oct 2025 13:45:00 +0000
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| First Time appeared |
Deno
Deno deno |
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| Vendors & Products |
Deno
Deno deno |
Wed, 08 Oct 2025 01:00:00 +0000
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| Description | Deno is a JavaScript, TypeScript, and WebAssembly runtime. In versions prior to 2.5.3 and 2.2.15, `Deno.FsFile.prototype.utime` and `Deno.FsFile.prototype.utimeSync` are not limited by the permission model check `--deny-write=./`. It's possible to change to change the access (`atime`) and modification (`mtime`) times on the file stream resource even when the file is opened with `read` only permission (and `write`: `false`) and file write operations are not allowed (the script is executed with `--deny-write=./`). Similar APIs like `Deno.utime` and `Deno.utimeSync` require `allow-write` permission, however, when a file is opened, even with read only flags and deny-write permission, it's still possible to change the access (`atime`) and modification (`mtime`) times, and thus bypass the permission model. Versions 2.5.3 and 2.2.15 fix the issue. | |
| Title | Deno's --deny-write check does not prevent permission bypass | |
| Weaknesses | CWE-266 | |
| References |
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| Metrics |
cvssV3_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2025-10-08T00:37:01.869Z
Updated: 2025-10-08T18:59:12.863Z
Reserved: 2025-09-30T19:43:49.902Z
Link: CVE-2025-61785
Updated: 2025-10-08T18:59:06.371Z
Status : Analyzed
Published: 2025-10-08T01:15:32.847
Modified: 2025-10-16T18:12:40.397
Link: CVE-2025-61785
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