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The Wire · Showcase

UNDICI PATCHES SOCKET HANG, IMPORT-IN-THE-MIDDLE FIXES BUILTIN INTEROP

By RepoJournal · Filed · About Node.js

Undici shipped critical fixes for parser deadlock under backpressure and idle socket validation, while import-in-the-middle resolved compatibility issues with CJS builtins that block instrumentation.

Undici landed two high-impact fixes overnight. The first [1] removes an assert that was throwing uncatchable errors when the HTTP/1 parser paused under backpressure and the socket ended, a scenario that could hang connections. The second [2] guards idle socket validation to skip fresh sockets, addressing a security advisory. Together these close gaps that have been tripping production deployments. Import-in-the-middle v3.0.2 [3] fixed proxying logic for builtins used as CommonJS [4], resolving conflicts when both IITM and tracing hooks register on the same process. The Node.js learn site added nested sidebar navigation [5] for Diagnostics and Node-API child articles, improving discoverability. Documentation cleanup continued across undici with corrected API signatures and restored links [6] [7]. Semver 7.8.3 [8] and eslint-plugin-n 18.1.0 [9] shipped minor updates across the linting preset.

Action items

References

  1. [1] fix: handle paused parser on socket end (issue #5360) (#5389) nodejs/undici
  2. [2] fix: guard idle socket validation to skip fresh sockets nodejs/undici
  3. [3] import-in-the-middle: v3.0.2 ↗ nodejs/import-in-the-middle
  4. [4] fix: Updated proxying logic for builtins that are used as CJS ↗ nodejs/import-in-the-middle
  5. [5] feat(sidebar): add sub-article navigation ↗ nodejs/learn
  6. [6] docs: fix multiple inaccuracies in API documentation (#5384) nodejs/undici
  7. [7] docs: fix remaining broken links in API documentation (#5342) nodejs/undici
  8. [8] build(deps): bump semver from 7.8.1 to 7.8.3 in the prod group ↗ nodejs/remark-preset-lint-node
  9. [9] build(deps-dev): bump eslint-plugin-n from 18.0.1 to 18.1.0 in the dev group ↗ nodejs/remark-preset-lint-node

FAQ

What changed in Node.js on June 8, 2026?
Undici shipped critical fixes for parser deadlock under backpressure and idle socket validation, while import-in-the-middle resolved compatibility issues with CJS builtins that block instrumentation.
What should Node.js teams do about it?
Update undici immediately if running HTTP/1 with backpressure scenarios • Upgrade import-in-the-middle to 3.0.2 if using both IITM and tracing hooks • Review undici security advisory GHSA-35p6-xmwp-9g52 for idle socket context
Which Node.js repositories shipped on June 8, 2026?
nodejs/undici, nodejs/import-in-the-middle, nodejs/learn, nodejs/remark-preset-lint-node

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