CVE-2026-49401 HIGH

CVE-2026-49401: Deno Permission Bypass via Unicode Normalization Mismatch on macOS (APFS)

Vendor Denoland
Product deno
Weakness CWE-41
Published June 23, 2026
Last update July 31, 2026
View on NVD All CVEs

CVSS base score

7.3/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality Low
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N

What the vulnerability does

01Description

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.7.14, 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 Unicode spellings of the same name as the same file. That means a program could reach a denied path by spelling it differently than the deny rule. This vulnerability is fixed in 2.7.14.

Key dates

02Disclosure timeline

June 23, 2026 CVE published
July 31, 2026 Record updated