Low
Deno's --deny-write check does not prevent permission bypass
Type: advisorySources: OSV
Deno is a JavaScript, TypeScript, and WebAssembly runtime. In versions prior to 2.5.3 and 2.2.15, `Deno.FsFile.prototype.utime` and `Deno.FsFile.prototype.utimeSync` are not limited by the permission model check `--deny-write=./`. It's possible to change to change the access (`atime`) and modification (`mtime`) times on the file stream resource even when the file is opened with `read` only permission (and `write`: `false`) and file write operations are not allowed (the script is executed with `--deny-write=./`). Similar APIs like `Deno.utime` and `Deno.utimeSync` require `allow-write` permission, however, when a file is opened, even with read only flags and deny-write permission, it's still possible to change the access (`atime`) and modification (`mtime`) times, and thus bypass the permission model. Versions 2.5.3 and 2.2.15 fix the issue.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-61785
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 14:16 UTC · Revision 1
Source evidence
Deno's --deny-write check does not prevent permission bypass
core-osv · Original sourcePublished 8 Oct 2025, 00:37 UTC
Deno is a JavaScript, TypeScript, and WebAssembly runtime. In versions prior to 2.5.3 and 2.2.15, `Deno.FsFile.prototype.utime` and `Deno.FsFile.prototype.utimeSync` are not limited by the permission model check `--deny-write=./`. It's possible to change to change the access (`atime`) and modification (`mtime`) times on the file stream resource even when the file is opened with `read` only permission (and `write`: `false`) and file write operations are not allowed (the script is executed with `--deny-write=./`). Similar APIs like `Deno.utime` and `Deno.utimeSync` require `allow-write` permission, however, when a file is opened, even with read only flags and deny-write permission, it's still possible to change the access (`atime`) and modification (`mtime`) times, and thus bypass the permission model. Versions 2.5.3 and 2.2.15 fix the issue.
osv:CVE-2025-61785
Complete source record
{
"id": "4780e9f88c07c65d68f831d3fd00abe99baac2016b6219f2d9736a24c456859c",
"url": "https://osv.dev/vulnerability/CVE-2025-61785",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Deno's --deny-write check does not prevent permission bypass",
"summary": "Deno is a JavaScript, TypeScript, and WebAssembly runtime. In versions prior to 2.5.3 and 2.2.15, `Deno.FsFile.prototype.utime` and `Deno.FsFile.prototype.utimeSync` are not limited by the permission model check `--deny-write=./`. It's possible to change to change the access (`atime`) and modification (`mtime`) times on the file stream resource even when the file is opened with `read` only permission (and `write`: `false`) and file write operations are not allowed (the script is executed with `--deny-write=./`). Similar APIs like `Deno.utime` and `Deno.utimeSync` require `allow-write` permission, however, when a file is opened, even with read only flags and deny-write permission, it's still possible to change the access (`atime`) and modification (`mtime`) times, and thus bypass the permission model. Versions 2.5.3 and 2.2.15 fix the issue.",
"evidence": "osv:CVE-2025-61785",
"products": [],
"severity": "low",
"structured": {
"id": "CVE-2025-61785",
"aliases": [
"CVE-2025-61785",
"GHSA-vg2r-rmgp-cgqj"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
}
],
"affected": [
{
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"type": "GIT",
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{
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"source": "REFERENCES_TAG",
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-61785.json"
}
}
],
"modified": "2026-10-28T02:30:29.218868929Z",
"provider": "osv",
"references": [
"https://github.com/denoland/deno/releases/tag/v2.2.15",
"https://github.com/denoland/deno/releases/tag/v2.5.3",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/61xxx/CVE-2025-61785.json",
"https://github.com/denoland/deno/security/advisories/GHSA-vg2r-rmgp-cgqj",
"https://nvd.nist.gov/vuln/detail/CVE-2025-61785",
"https://github.com/denoland/deno/commit/992e998dfe436cdc9325232759af8be92f11739b",
"https://github.com/denoland/deno/pull/30872"
],
"provider_metadata": {
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],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/61xxx/CVE-2025-61785.json"
}
},
"related_cves": [
{
"value": "CVE-2025-61785",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 496284,
"published_at": "2025-10-08T00:37:01.869+00:00"
}