CVE-2025-61785

Date: October 7, 2025

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.