CVE-2026-49401

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

HIGH

8.4

CVSS Score

Published: June 23, 2026 at 05:22 PM UTC

Updated: October 25, 2026 at 11:10 PM UTC

2 products affected across 2 vendorsDenoDeno· also runs on 1 platform

Using deno by denoland?

Get instant alerts when new vulnerabilities affect deno - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

HIGH8.4

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Deno · Denocargo

95%

v < 2.7.14

Affected range stops below 2.7.14, so it looks safe — our inference, not a vendor statement

apple-macos (environment)

Deno · Denoland

90%

v < 2.7.14

Affected range stops below 2.7.14, so it looks safe — our inference, not a vendor statement

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

macOS · Apple

95%

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

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

References (1)

x_refsource_CONFIRMExploitMitigationVendor Advisory

Source: cverecord

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.4HIGH[email protected]

Attack Vector: LOCAL
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: CHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-41CWE-176

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card