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CVE-2026-21716

Quick assessment

Affected
nodejs node
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.

Node.js是Node.js开源的一个开源、跨平台的 JavaScript 运行时环境。 Node.js 20.x版本、22.x版本、24.x版本和25.x版本存在安全漏洞，该漏洞源于权限模型文件系统执行中缺少对FileHandle.chmod和FileHandle.chown的权限检查，可能导致绕过文件系统写入限制。

AI Predicted 5.5 Difficulty: Easy EPSS 0.15% · P4
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I. Basic Information for CVE-2026-21716

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An incomplete fix for CVE-2024-36137 leaves `FileHandle.chmod()` and `FileHandle.chown()` in the promises API without the required permission checks, while their callback-based equivalents (`fs.fchmod()`, `fs.fchown()`) were correctly patched. As a result, code running under `--permission` with restricted `--allow-fs-write` can still use promise-based `FileHandle` methods to modify file permissions and ownership on already-open file descriptors, bypassing the intended write restrictions. This vulnerability affects **20.x, 22.x, 24.x, and 25.x** processes using the Permission Model where `--allow-fs-write` is intentionally restricted.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Node.js 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Node.js是Node.js开源的一个开源、跨平台的 JavaScript 运行时环境。 Node.js 20.x版本、22.x版本、24.x版本和25.x版本存在安全漏洞，该漏洞源于权限模型文件系统执行中缺少对FileHandle.chmod和FileHandle.chown的权限检查，可能导致绕过文件系统写入限制。
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
nodejs node 20.20.1 ~ 20.20.1 -

II. Public POCs for CVE-2026-21716

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III. Intelligence Information for CVE-2026-21716

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Security Blog Posts for CVE-2026-21716 (1)

Same Patch Batch · nodejs · 2026-03-30 · 8 CVEs total

CVE-2026-21714 Node.js 安全漏洞
CVE-2026-21717 Node.js 安全漏洞
CVE-2026-21712 Node.js 安全漏洞
CVE-2026-21713 Node.js 安全漏洞
CVE-2026-21710 Node.js 安全漏洞
CVE-2026-21715 Node.js 安全漏洞
CVE-2026-21711 Node.js 安全漏洞

IV. Related Vulnerabilities

Same product: node
Same vendor: nodejs

V. Comments for CVE-2026-21716

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