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Node.js Releases Urgent Patches for Multiple Vulnerabilities Exposing Systems to DoS and Crashes

## Node.js Security Update - Version 20.20.2 'Iron'

BBy Benjamin ScottMar 26, 20262 min read

Node.js Security Update - Version 20.20.2 'Iron'

The Node.js project has released a critical security update for its Long-Term Support (LTS) branch, identifying version 20.20.2 'Iron' as a security release. This update addresses seven vulnerabilities affecting TLS error handling, HTTP/2 flow control, cryptographic timing, and permission models. Several of these issues can be exploited remotely without authentication, posing a risk to unpatched servers.

The most severe vulnerability patched in this release is CVE-2026-21637, a high-severity flaw related to an incomplete fix in Node.js TLS error handling. This issue allows exceptions to bypass standard TLS error handlers, potentially leading to a crash of the Node.js process. The update secures SNICallback invocations within a try/catch block to prevent this issue.

Another critical fix addresses CVE-2026-21714, a medium-severity HTTP/2 flow control error involving unhandled nghttp2 error codes. Malicious clients can exploit this by sending malformed WINDOW_UPDATE frames, which may cause a memory leak and lead to a denial-of-service condition. Additionally, CVE-2026-21717 addresses a V8 engine vulnerability that could enable a HashDoS attack through predictable hash collisions.

This update addresses seven vulnerabilities affecting TLS error handling, HTTP/2 flow control, cryptographic timing, and permission models.
Benjamin Scott · Thehackingpost

Cryptographic and Permission Model Flaws

The update resolves CVE-2026-21713, a medium-severity cryptographic timing oracle in Web Cryptography HMAC verification, by implementing a timing-safe primitive. Two low-severity permission model bypasses, CVE-2026-21715 and CVE-2026-21716, are also addressed, which previously allowed filesystem path disclosure. The release also neutralizes a medium-severity HTTP header prototype pollution vector, CVE-2026-21710.

CVE-2026-21637: High severity, affects TLS/SNICallback, causes remote process crash. CVE-2026-21717: Medium severity, affects V8/JSON parsing, leads to HashDoS/CPU exhaustion. CVE-2026-21713: Medium severity, affects Web Crypto/HMAC, potential MAC forgery. CVE-2026-21714: Medium severity, affects HTTP/2/nghttp2, causes memory leak/DoS. CVE-2026-21710: Medium severity, affects HTTP headers, prototype pollution. CVE-2026-21716: Low severity, affects permission model (fs/promises), filesystem path disclosure. CVE-2026-21715: Low severity, affects permission model (realpath), filesystem path disclosure.

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System administrators and developers are advised to upgrade their environments immediately. Given that CVE-2026-21637 requires no authentication and can trigger immediate process termination, updating public-facing TLS servers is critical. Users should update to the following patched releases: v20.20.2, v22.22.2, v24.14.1, or v25.8.2. Installers and binaries are available through official Node.js distribution channels.

Based on reporting by GBHackers.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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