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CVE-2026-21717

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V8字符串哈希机制问题，可能导致哈希冲突可预测，进而可能显著降低进程性能。

AI Predicted 5.3 Difficulty: Easy EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 20

VendorProduct Version RangeStatus
nodejs node 20.20.1≤ 20.20.1 affected
22.22.1≤ 22.22.1 affected
24.14.0≤ 24.14.0 affected
25.8.1≤ 25.8.1 affected
4.0< 4.* affected
5.0< 5.* affected
6.0< 6.* affected
7.0< 7.* affected
… +12 more rows
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I. Basic Information for CVE-2026-21717

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw in V8's string hashing mechanism causes integer-like strings to be hashed to their numeric value, making hash collisions trivially predictable. By crafting a request that causes many such collisions in V8's internal string table, an attacker can significantly degrade performance of the Node.js process. The most common trigger is any endpoint that calls `JSON.parse()` on attacker-controlled input, as JSON parsing automatically internalizes short strings into the affected hash table. This vulnerability affects **20.x, 22.x, 24.x, and 25.x**.
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V8字符串哈希机制问题，可能导致哈希冲突可预测，进而可能显著降低进程性能。
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-2026-21717

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III. Intelligence Information for CVE-2026-21717

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Security Blog Posts for CVE-2026-21717 (1)

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

CVE-2026-21714 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-2026-21716 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

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