Skip to content
OpenAdvisories
Low · 3.3 CVE-2025-61785 EUVD-2025-31878GHSA-vg2r-rmgp-cgqj

Deno's --deny-write check does not prevent permission bypass

Published Oct 8, 2025 · Updated Oct 8, 2025 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
denoland deno >= 2.3.0, < 2.5.3, < 2.2.15 —

Affected packages

EcosystemPackageAffectedFixedRecord
crates.io deno < 2.5.3 2.5.3 GHSA-vg2r-rmgp-cgqj

References