CVE-2025-61785
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-08

Last updated on: 2025-10-16

Assigner: GitHub, Inc.

Description
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.
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Meta Information
Published
2025-10-08
Last Modified
2025-10-16
Generated
2026-06-16
AI Q&A
2025-10-08
EPSS Evaluated
2026-06-15
NVD
CVE-2025-61785
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
deno deno to 2.2.15 (inc)
deno deno From 2.3.0 (inc) to 2.5.3 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-266 A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.
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Executive Summary

This vulnerability in Deno versions prior to 2.5.3 and 2.2.15 allows a script to change the access time (atime) and modification time (mtime) of a file even when the file is opened with read-only permission and write operations are denied using the --deny-write=./ flag. Normally, APIs like Deno.utime require write permission, but due to this flaw, the permission model can be bypassed through Deno.FsFile.prototype.utime and utimeSync methods, allowing modification of file timestamps without proper write permissions. This issue is fixed in versions 2.5.3 and 2.2.15.

Impact Analysis

This vulnerability can impact you by allowing unauthorized modification of file metadata, specifically the access and modification timestamps, even when write permissions are denied. This could be used to hide unauthorized file access or changes, potentially aiding in evasion of monitoring or forensic analysis. However, it does not allow modification of the file content itself.

Mitigation Strategies

Upgrade Deno to version 2.5.3 or 2.2.15 or later, as these versions fix the issue where file access and modification times can be changed despite deny-write permissions.

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