blog: add DoS mitigation post for async_hooks stack exhaustion by mcollina · Pull Request #8542 · nodejs/nodejs.org

mcollina · 2026-01-13T15:30:31Z

Summary

Add blog post explaining the vulnerability where stack overflow errors became uncatchable when async_hooks was enabled
Affects React Server Components, Next.js, and APM tools
Documents the fix included in Node.js 20.20.0, 22.22.0, 24.13.0, and 25.3.0

Test plan

Build passes locally
Review content for accuracy
Verify all links work

vercel · 2026-01-13T15:30:37Z

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Project	Deployment	Review	Updated (UTC)
nodejs-org	Ready	Preview	Jan 13, 2026 5:05pm

github-actions · 2026-01-13T15:30:45Z

👋 Codeowner Review Request

The following codeowners have been identified for the changed files:

Team reviewers: @nodejs/nodejs-website

Please review the changes when you have a chance. Thank you! 🙏

codecov · 2026-01-13T15:34:34Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.01%. Comparing base (3dff177) to head (80db087).
⚠️ Report is 8 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8542      +/-   ##
==========================================
+ Coverage   75.00%   75.01%   +0.01%     
==========================================
  Files         103      103              
  Lines        9036     9036              
  Branches      311      311              
==========================================
+ Hits         6777     6778       +1     
+ Misses       2257     2256       -1     
  Partials        2        2

☔ View full report in Codecov by Sentry.
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github-actions · 2026-01-13T15:38:16Z

📦 Build Size Comparison

Summary

Metric	Value
Old Total Size	3.74 MB
New Total Size	3.74 MB
Delta	326.00 B (+0.01%)

Changes

➕ Added Assets (1)

Name	Size
`.next/static/chunks/136e4ef93d7a1c9e.js`	205.34 KB

➖ Removed Assets (1)

Name	Size
`.next/static/chunks/3c28d9721281dc72.js`	205.02 KB

Copilot

Pull request overview

This PR adds a comprehensive blog post documenting a critical DoS vulnerability affecting Node.js applications that use async_hooks, including React Server Components, Next.js, and all major APM tools. The vulnerability caused stack overflow errors to become uncatchable when async_hooks was enabled, leading to immediate process crashes with exit code 7.

Changes:

Added detailed vulnerability disclosure blog post explaining the async_hooks stack exhaustion issue
Documents the fix included in Node.js 20.20.0, 22.22.0, 24.13.0, and 25.3.0
Provides technical deep dive, code examples, timeline, and mitigation guidance

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apps/site/pages/en/blog/vulnerability/january-2026-dos-mitigation-async-hooks.md

joyeecheung · 2026-01-13T16:00:55Z

I have some leftover suggestions from the original draft, I'll duplicate them here..

apps/site/pages/en/blog/vulnerability/january-2026-dos-mitigation-async-hooks.md

mcollina · 2026-01-13T16:18:44Z

@joyeecheung @marco-ippolito @RafaelGSS ping

apps/site/pages/en/blog/vulnerability/january-2026-dos-mitigation-async-hooks.md

marco-ippolito · 2026-01-13T16:20:43Z

the new-post.md and npmrc file should be dropped

Add blog post explaining the vulnerability where stack overflow errors became uncatchable when async_hooks was enabled, affecting React Server Components, Next.js, and APM tools. Co-Authored-By: Joyee Cheung <joyeec9h3@gmail.com>

mcollina · 2026-01-13T16:29:36Z

@marco-ippolito @RafaelGSS @joyeecheung ptal

apps/site/pages/en/blog/vulnerability/january-2026-dos-mitigation-async-hooks.md

mcollina · 2026-01-13T17:04:10Z

@joyeecheung ping

mcollina requested review from RafaelGSS and marco-ippolito January 13, 2026 15:30

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mcollina force-pushed the blog/january-2026-dos-mitigation-async-hooks branch from 6c101fd to 66b49c1 Compare January 13, 2026 17:02

blog: reorganize sections per review feedback

80db087

mcollina force-pushed the blog/january-2026-dos-mitigation-async-hooks branch from 66b49c1 to 80db087 Compare January 13, 2026 17:03

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Merged via the queue into main with commit f0cb063 Jan 13, 2026
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mcollina deleted the blog/january-2026-dos-mitigation-async-hooks branch January 13, 2026 17:34

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mcollina commented Jan 13, 2026

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