CVE-2025-61785
Deno's --deny-write check does not prevent permission bypass
- State
- Published
- Severity
- 3.3 Low
- Published
- Oct 8, 2025
- Updated
- Oct 8, 2025
- Reserved
- Sep 30, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.0 | 3.3 Low | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N | GitHub_M |
Weaknesses
- CWE-266 Incorrect Privilege Assignment
Affected Products
| Product | Versions |
|---|---|
denodenoland |
|
References
- https://github.com/denoland/deno/security/advisories/GHSA-vg2r-rmgp-cgqj
- https://github.com/denoland/deno/pull/30872
- https://github.com/denoland/deno/commit/992e998dfe436cdc9325232759af8be92f11739b
- https://github.com/denoland/deno/releases/tag/v2.2.15
- https://github.com/denoland/deno/releases/tag/v2.5.3
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