JLSEC-2026-655 Deno: Permission Bypass via Unicode Normalization Mismatch on macOS (APFS)

Summary Deno's permission system enforces filesystem and execution restrictions by comparing the requested path against the path supplied to --deny-read, --deny-write, --deny-run, or --deny-ffi. On macOS, that comparison was done at the raw-byte level while the APFS filesystem treats different...

GHSA-8XPQ-CJCF-3WH9 Deno: Permission Bypass via Unicode Normalization Mismatch on macOS (APFS)

Summary Deno's permission system enforces filesystem and execution restrictions by comparing the requested path against the path supplied to --deny-read, --deny-write, --deny-run, or --deny-ffi. On macOS, that comparison was done at the raw-byte level while the APFS filesystem treats different...

Deno: process.loadEnvFile() bypasses env permission checks and mutates process.env with only read access

Summary In Deno, environment access is gated by the env permission. You can deny it with --deny-env, or restrict it to a specific allowlist with --allow-env=FOO,BAR. The expectation is that a program running without env permission cannot change process.env. process.loadEnvFile the Node-compatible...

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

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 a...

RUSTSEC-2025-0138 --allow-read / --allow-write permission bypass in `node:sqlite`

It is possible to bypass Deno's read/write permission checks by using ATTACH DATABASE statement. PoC // poc.js import DatabaseSync from "node:sqlite" const db = new DatabaseSync":memory:"; db.exec"ATTACH DATABASE 'test.db' as test;"; db.exec"CREATE TABLE test.test id INTEGER PRIMARY KEY, name...