# Fastify v5.8.2

- Product: Fastify (https://whatsnew.fyi/product/fastify)
- Vendor: Fastify
- Date: 2026-03-07
- Version: v5.8.2
- Original notes: https://github.com/fastify/fastify/releases/tag/v5.8.2
- Permalink: https://whatsnew.fyi/product/fastify/releases/v5.8.2

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **fixed** — Anchor keyValuePairsReg to prevent quadratic backtracking

##### What's Changed
* docs(ecosystem): add @yeliex/fastify-problem-details by @yeliex in https://github.com/fastify/fastify/pull/6546
* Revert "chore: upgrade borp to v1.0.0" by @climba03003 in https://github.com/fastify/fastify/pull/6564
* docs: document body validation with custom content type parsers by @mcollina in https://github.com/fastify/fastify/pull/6556
* docs(ecosystem): add fastify-file-router by @bhouston in https://github.com/fastify/fastify/pull/6441
* docs: add fastify-svelte-view to Ecosystem list by @matths in https://github.com/fastify/fastify/pull/6453
* fix: anchor keyValuePairsReg to prevent quadratic backtracking by @mcollina in https://github.com/fastify/fastify/pull/6558
* docs: added note on handling of invalid URLs in setNotFoundHandler by @leftieFriele in https://github.com/fastify/fastify/pull/5661
* docs(guides): update codemod links by @OluchiEzeifedikwa in https://github.com/fastify/fastify/pull/6479
* docs: add @glidemq/fastify to community plugins by @avifenesh in https://github.com/fastify/fastify/pull/6560

##### New Contributors
* @yeliex made their first contribution in https://github.com/fastify/fastify/pull/6546
* @matths made their first contribution in https://github.com/fastify/fastify/pull/6453
* @leftieFriele made their first contribution in https://github.com/fastify/fastify/pull/5661
* @OluchiEzeifedikwa made their first contribution in https://github.com/fastify/fastify/pull/6479
* @avifenesh made their first contribution in https://github.com/fastify/fastify/pull/6560

**Full Changelog**: https://github.com/fastify/fastify/compare/v5.8.1...v5.8.2