CVE-2026-49401: Deno

High severity, CVSS 8.4. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Deno Deno: before 2.7.14 (fixed in 2.7.14)

Published 2026-06-23. Last modified 2026-06-26.