What’s Vulnerable › Vulnerabilities
CVE-2026-49401: Deno Permission Bypass via Unicode Normalization Mismatch on macOS (APFS)
- Severity: high (CVSS 8.4 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-06-23 · updated 2026-10-25
- Weakness: CWE-41
Description
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
- denoland deno: before 2.7.14 — fixed in 2.7.14
How to fix
Upgrade to a fixed version: denoland deno 2.7.14. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-49401 or the next vulnerability affects your stack