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TI-2026-36566 Aliases CVE-2026-49401GHSA-8xpq-cjcf-3wh9

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

Priority LOW 36CWE-176Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00197 9th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed deno (denoland): 2.7.14deno (crates.io): 2.7.14

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
denolanddenobefore 2.7.142.7.14Patch availableCNA
—deno (crates.io)before 2.7.142.7.14Patch availableGHSA-8xpq-cjcf-3wh9
  • deno Vendordenoland Affected before 2.7.14 Fixed in 2.7.14 Patch available CNA
  • deno (crates.io) Vendor— Affected before 2.7.14 Fixed in 2.7.14 Patch available GHSA-8xpq-cjcf-3wh9

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*before 2.7.14Vulnerabledenoland
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*not specified by NVDRunning onApple
  • cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:* Versions before 2.7.14 Vulnerable ·denoland
  • cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Apple

Remediation

  • Fix · CNA deno (denoland) Fixed in 2.7.14
  • Fix · GHSA-8xpq-cjcf-3wh9 deno (crates.io) Fixed in 2.7.14 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-49401
  2. 2026-10-03 Alias added: GHSA-8xpq-cjcf-3wh9

References

Exploit 1

Advisory 1

Other 1

  • TI-2026-21627 Deno has a Command Injection via Incomplete shell metacharacter blocklist in node:child_process CVSS 3.1CRITICAL 9.8
  • TI-2025-17782 Deno's AES GCM authentication tags are not verified CVSS 4.0HIGH 7.7
  • TI-2024-18537 *const c_void / ExternalPointer unsoundness leading to use-after-free CVSS 3.1HIGH 8.8
  • TI-2024-18536 Deno arbitrary file descriptor close via `op_node_ipc_pipe()` leading to permission prompt bypass CVSS 3.1HIGH 8.8
  • TI-2023-12990 Deno is vulnerable to interactive `run` permission prompt spoofing via improper ANSI neutralization CVSS 3.1HIGH 8.8
  • TI-2023-11328 Regular expression denial of service in deno CVSS 3.1HIGH 7.5
See all 37 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences