CVE-2025-61786 – Deno’s –deny-read check does not prevent permission bypass

CVE ID : CVE-2025-61786

Published : Oct. 8, 2025, 1:15 a.m. | 1 hour, 20 minutes ago

Description : 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.

Severity: 3.3 | LOW

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