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multipart-v0.8.0

actix/actix-webmultipart-v0.8.0Jun 21, 2026by JohnTitor

AI Summary

Enhances multipart parsing with new builder helpers and fixes a potential memory issue by introducing a buffer size limit.

Key Highlights

  • Adds multi-field multipart payload builders for testing
  • Adds `MultipartForm` support for `Option<Vec<T>>`
  • Prevents unbounded memory growth with a 64KB buffer cap
  • Updates Minimum Supported Rust Version (MSRV) to 1.88

Breaking Changes

  • Buffer limit behavior change (64KB cap)
  • MSRV bump to 1.88

New Features

  • MultipartConfig::buffer_limit

Full Release Notes

## 0.8.0

- Add multi-field multipart payload builders to `actix_multipart::test`. [#3575]
- Add `MultipartForm` support for `Option<Vec<T>>` fields. [#3577]
- Bound internal multipart parser buffering to prevent unbounded memory growth on malformed bodies.
  - behavior change notice: There's now a cap for buffering (64KB). It can be changed with `MultipartConfig::buffer_limit`.
- Fix user-triggerable panic when parsing multipart boundaries.
- Minimum supported Rust version (MSRV) is now 1.88.
- Update `rand` dependency to `0.10`.

[#3577]: https://github.com/actix/actix-web/pull/3577
[#3575]: https://github.com/actix/actix-web/issues/3575