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CVE-2025-61785— Deno's --deny-write check does not prevent permission bypass

Quick assessment

Affected
denoland deno
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Deno是Deno开源的一个简单、现代且安全的 JavaScript 和 TypeScript 运行环境。 Deno 2.5.3之前版本和2.2.15之前版本存在安全漏洞，该漏洞源于utime和utimeSync方法未受权限模型限制，可能导致绕过权限模型。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1222.002 · Linux and Mac Permissions
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I. Basic Information for CVE-2025-61785

Vulnerability Information
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Vulnerability Title
Deno's --deny-write check does not prevent permission bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
特权授予不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Deno 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Deno是Deno开源的一个简单、现代且安全的 JavaScript 和 TypeScript 运行环境。 Deno 2.5.3之前版本和2.2.15之前版本存在安全漏洞，该漏洞源于utime和utimeSync方法未受权限模型限制，可能导致绕过权限模型。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
denoland deno >= 2.3.0, < 2.5.3 -

II. Public POCs for CVE-2025-61785

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III. Intelligence Information for CVE-2025-61785

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Patches & Fixes for CVE-2025-61785 (2)

Vendor Advisories for CVE-2025-61785 (1)

Vendor Pages for CVE-2025-61785 (2)

Same Patch Batch · denoland · 2025-10-08 · 3 CVEs total

CVE-2025-61787 8.1 HIGH Deno is Vulnerable to Command Injection on Windows During Batch File Execution
CVE-2025-61786 3.3 LOW Deno's --deny-read check does not prevent permission bypass

IV. Related Vulnerabilities

Same product: deno
Same vendor: denoland
Same weakness: CWE-266

V. Comments for CVE-2025-61785

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