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CVE-2026-21637

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存在安全漏洞，该漏洞源于TLS错误处理存在缺陷，当使用pskCallback或ALPNCallback时，远程攻击者可能使TLS服务器崩溃或耗尽资源，导致拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 1.10% · P63

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-21637

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw in Node.js TLS error handling allows remote attackers to crash or exhaust resources of a TLS server when `pskCallback` or `ALPNCallback` are in use. Synchronous exceptions thrown during these callbacks bypass standard TLS error handling paths (tlsClientError and error), causing either immediate process termination or silent file descriptor leaks that eventually lead to denial of service. Because these callbacks process attacker-controlled input during the TLS handshake, a remote client can repeatedly trigger the issue. This vulnerability affects TLS servers using PSK or ALPN callbacks across Node.js versions where these callbacks throw without being safely wrapped.
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存在安全漏洞，该漏洞源于TLS错误处理存在缺陷，当使用pskCallback或ALPNCallback时，远程攻击者可能使TLS服务器崩溃或耗尽资源，导致拒绝服务。
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 20.19.6 ~ 20.19.6 -

II. Public POCs for CVE-2026-21637

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III. Intelligence Information for CVE-2026-21637

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Security Blog Posts for CVE-2026-21637 (1)

Same Patch Batch · nodejs · 2026-01-20 · 8 CVEs total

CVE-2026-21636 Node.js 安全漏洞
CVE-2025-59465 Node.js 安全漏洞
CVE-2025-59464 Node.js 安全漏洞
CVE-2025-59466 Node.js 安全漏洞
CVE-2025-55132 Node.js 安全漏洞
CVE-2025-55130 Node.js 安全漏洞
CVE-2025-55131 Node.js 安全漏洞

IV. Related Vulnerabilities

Same product: node
Same vendor: nodejs

V. Comments for CVE-2026-21637

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