CVE-2026-49401CWE-176CWE-41

Deno Permission Bypass via Unicode Normalization Mismatch on macOS (APFS)

High · published June 23, 2026

CVSS v3.1
7.3
EPSS
0%
Percentile
9.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.3 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00197 · 9.5th percentile
Weaknesses
CWE-176 · Improper Handling of Unicode Encoding; CWE-41 · Improper Resolution of Path Equivalence
Published
2026-06-23T17:22Z
EPSS history
Timeline
  • 23 JUN 17:22Z
    Deno Permission Bypass via Unicode Normalization Mismatch on macOS (APFS)
    cvelistv5