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v5.12.6

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Fastify·Oct 13, 2026, 06:52 AMFixSecurity-relevantAI-assisted summary

Summary

Security fix addressing advisory GHSA-389g-gv7q-r4x8.
Performance and reliability improvements: decode string bodies once, avoid resetting child logger levels, use FIFO cache for parsed content types, and fix reply.mediaType resolution.
Various bug fixes (header name case handling, set‑cookie handling, empty query body error) and documentation update for fastify.query().

securitybugfixminordocssource healthy

Official source Last checked Oct 19, 2026, 3:01 PM

Skip this version — install 5.12.7 instead.

Followed by 5.12.7 within 1 h — likely a hotfix.

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Every summary should remain traceable to the original changelog or release source.

AI-assisted summarysource healthyLast checked Oct 19, 2026, 3:01 PM

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