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

Read the record on cve.org

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

CVSSScoreVectorSource
3.03.3 LowCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:NGitHub_M

Weaknesses

  • CWE-266 Incorrect Privilege Assignment

Affected Products

ProductVersions
denodenoland
  • >= 2.3.0, < 2.5.3Affected
  • < 2.2.15Affected

References

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