High
Deno Permission Bypass via Unicode Normalization Mismatch on macOS (APFS)
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-49401
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 14:23 UTC · Revision 1
Source evidence
Deno Permission Bypass via Unicode Normalization Mismatch on macOS (APFS)
core-osv · Original sourcePublished 23 Jun 2026, 17:22 UTC
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.
osv:CVE-2026-49401
Complete source record
{
"id": "522f2e5853a968bccd6b7a1de2ff9d60c2a3aa893465f0b9490861199140f147",
"url": "https://osv.dev/vulnerability/CVE-2026-49401",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Deno Permission Bypass via Unicode Normalization Mismatch on macOS (APFS)",
"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.",
"evidence": "osv:CVE-2026-49401",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-49401",
"aliases": [
"CVE-2026-49401",
"GHSA-8xpq-cjcf-3wh9"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N"
}
],
"affected": [
{
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{
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"modified": "2026-10-28T02:30:29.365035951Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49401.json",
"https://github.com/denoland/deno/security/advisories/GHSA-8xpq-cjcf-3wh9",
"https://nvd.nist.gov/vuln/detail/CVE-2026-49401"
],
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},
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 496349,
"published_at": "2026-06-23T17:22:32.266+00:00"
}