Deno's --deny-write check does not prevent permission bypass

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-61785
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-10-08 01:15:32 UTC
Updated2026-10-08 13:10:00 UTC
DescriptionDeno 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.

Risk And Classification

Primary CVSS: v3.1 3.3 LOW from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS: 0.002000000 probability, percentile 0.089920000 (date 2026-10-08)

Problem Types: CWE-266 | CWE-266 CWE-266: Incorrect Privilege Assignment

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary3.3LOWCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
3.0[email protected]Secondary3.3LOWCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
3.0CNADECLARED3.3LOWCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS v3.0 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Deno Deno All All All All
Application Deno Deno All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Denoland Deno affected >= 2.3.0, < 2.5.3 Not specified
CNA Denoland Deno affected < 2.2.15 Not specified

References

ReferenceSourceLinkTags
github.com/denoland/deno/security/advisories/GHSA-vg2r-rmgp-cgqj [email protected] github.com Exploit, Vendor Advisory
github.com/denoland/deno/releases/tag/v2.2.15 [email protected] github.com Release Notes
github.com/denoland/deno/pull/30872 [email protected] github.com Issue Tracking, Patch
github.com/denoland/deno/commit/992e998dfe436cdc9325232759af8be92f11739b [email protected] github.com Patch
github.com/denoland/deno/releases/tag/v2.5.3 [email protected] github.com Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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