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CVE-2026-49401

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

Published: Jun 23, 2026Updated: Jun 26, 2026 Sources: CVE List NVDCWE-41
7.3HIGH
NVD MITRE
EPSS Score
0.2%
Top 91.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:CC:LI:HA:N
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-41CWE-176

Affected Products

denoland
oss-project·USaka deno
denoOn-prem
OSS Libraries / generic-library
deno
oss-projectaka deno runtime, deno standard modules
denoLibrary
OSS Libraries / generic-library

Exploitability

Workaround Available
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References

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

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