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FastAPI & Pydantic

FastAPI & Pydantic

FastAPI and the Pydantic + SQLModel async-Python stack

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The Wire · Showcase

AUTHLIB FIXES REDIRECT VULNERABILITY, PYTHON-MULTIPART SHIPS PERFORMANCE WIN

By RepoJournal · Filed · About FastAPI & Pydantic

FastAPI's dependency stack got tighter overnight: authlib patches a redirect validation hole while python-multipart cuts boundary scanning overhead.

The authlib update [1] fixes a critical redirect URI validation gap in OpenID flows that could let attackers hijack auth redirects on InvalidScopeError conditions. That's a real threat in production OAuth stacks. In parallel, python-multipart [2] shipped a performance rewrite that replaces naive boundary scanning with native bytes.find calls, a win for any FastAPI endpoint accepting file uploads at scale. pymdown-extensions [3] also patched a directory traversal hole in snippet loading when restrict_base_path is enabled, which matters if you're auto-generating docs from untrusted sources. On the tooling side, CodSpeedHQ action [4] added environment variable controls for perf compression, making CI benchmarking more flexible. Pydantic's desk stayed quiet with doc link housekeeping [5], nothing structural.

Action items

References

  1. [1] ⬆ Bump authlib from 1.6.11 to 1.7.2 ↗ fastapi/fastapi
  2. [2] ⬆ Bump python-multipart from 0.0.26 to 0.0.29 ↗ fastapi/fastapi
  3. [3] ⬆ Bump pymdown-extensions from 10.21.2 to 10.21.3 ↗ fastapi/fastapi
  4. [4] ⬆ Bump CodSpeedHQ/action from 4.14.0 to 4.15.1 ↗ fastapi/fastapi
  5. [5] Update documentation links ↗ pydantic/pydantic

FAQ

What changed in FastAPI & Pydantic on May 29, 2026?
FastAPI's dependency stack got tighter overnight: authlib patches a redirect validation hole while python-multipart cuts boundary scanning overhead.
What should FastAPI & Pydantic teams do about it?
Upgrade authlib to 1.6.12 before next OAuth deployment • Pull python-multipart 0.0.28 in your next dependency sync for file upload gains • Review pymdown-extensions 10.21.3 if you auto-generate docs
Which FastAPI & Pydantic repositories shipped on May 29, 2026?
fastapi/fastapi, pydantic/pydantic

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