CVE-2026-49406

The CVE describes a vulnerability in Deno when run in BYONM mode (nodeModulesDir: "manual"): the module resolver could bypass the read boundary by resolving a package.json main field containing .. segments, allowing a malicious package to read files outside the approved --allow-read scope via req...

CVE-2026-49406 Deno: BYONM module resolution allows `package.json` main path traversal to bypass `--allow-read` restrictions

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.7.12, when Deno was run in BYONM mode nodeModulesDir: "manual", the module resolver did not validate that a package's resolved entrypoint stayed within its nodemodules// directory. A malicious package.json whose main field...

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...

JLSEC-2026-107 Deno permission escalation vulnerability via open of privileged files with missing `--deny` flag

The Deno sandbox may be unexpectedly weakened by allowing file read/write access to privileged files in various locations on Unix and Windows platforms. For example, reading /proc/self/environ may provide access equivalent to --allow-env, and writing /proc/self/mem may provide access equivalent t...

JLSEC-2026-109 Deno run with --allow-read and --deny-read flags results in allowed

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Starting in version 1.41.3 and prior to versions 2.1.13, 2.2.13, and 2.3.2, deno run --allow-read --deny-read main.ts results in allowed, even though 'deny' should be stronger. The result is the same with all global unary permissions give...

CVE-2026-21715

A flaw in Node.js Permission Model filesystem enforcement leaves fs.realpathSync.native without the required read permission checks, while all comparable filesystem functions correctly enforce them. As a result, code running under --permission with restricted --allow-fs-read can still use...

CVE-2026-21715

A flaw in Node.js Permission Model filesystem enforcement leaves fs.realpathSync.native without the required read permission checks, while all comparable filesystem functions correctly enforce them. As a result, code running under --permission with restricted --allow-fs-read can still use...

nodejs: Nodejs file permissions bypass

A flaw in Node.js’s Permissions model allows attackers to bypass --allow-fs-read and --allow-fs-write restrictions using crafted relative symlink paths. By chaining directories and symlinks, a script granted access only to the current directory can escape the allowed path and read sensitive files...

CVE-2025-55130

A flaw in Node.js’s Permissions model allows attackers to bypass --allow-fs-read and --allow-fs-write restrictions using crafted relative symlink paths. By chaining directories and symlinks, a script granted access only to the current directory can escape the allowed path and read sensitive files...

SUSE CVE-2025-48888

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Starting in version 1.41.3 and prior to versions 2.1.13, 2.2.13, and 2.3.2, deno run --allow-read --deny-read main.ts results in allowed, even though 'deny' should be stronger. The result is the same with all global unary permissions give...

GHSA-XQXC-X6P3-W683 Deno run with --allow-read and --deny-read flags results in allowed

Summary deno run --allow-read --deny-read main.ts results in allowed, even though 'deny' should be stronger. Same with all global unary permissions given as --allow- --deny-. Details Caused by the fast exit logic in 22894. PoC Run the above command expecting no permissions to be passed. Impact Th...

Deno run with --allow-read and --deny-read flags results in allowed

Summary deno run --allow-read --deny-read main.ts results in allowed, even though 'deny' should be stronger. Same with all global unary permissions given as --allow- --deny-. Details Caused by the fast exit logic in 22894. PoC Run the above command expecting no permissions to be passed. Impact Th...

SUSE CVE-2023-30583

fs.openAsBlob can bypass the experimental permission model when using the file system read restriction with the --allow-fs-read flag in Node.js 20. This flaw arises from a missing check in the fs.openAsBlob API. Please note that at the time this CVE was issued, the permission model is an...