CVE-2026-49401

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

State: Published
Severity: 7.3 High
Published: Jun 23, 2026
Updated: Jul 31, 2026
Reserved: May 29, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.3 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N	GitHub_M

Weaknesses

CWE-41 Improper Resolution of Path Equivalence
CWE-176 Improper Handling of Unicode Encoding

Affected Products

Product	Versions
denodenoland	< 2.7.14Affected

References

https://github.com/denoland/deno/security/advisories/GHSA-8xpq-cjcf-3wh9

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