EUVD-2026-254458

fkie_cve-2025-61786

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.

GHSA-qq26-84mh-26j9 — Deno's --deny-read check does not prevent permission bypass

Affected: crates.io: deno

### 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 --de…

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EUVD-2026-254458

fkie_cve-2025-61786

GHSA-qq26-84mh-26j9 — Deno's --deny-read check does not prevent permission bypass