Sourced from yarl's releases.

1.20.1

Bug fixes

• Started raising a :exc:ValueError exception raised for corrupted IPv6 URL values.

  These fixes the issue where exception :exc:IndexError was leaking from the internal code because of not being handled and transformed into a user-facing error. The problem was happening under the following conditions: empty IPv6 URL, brackets in reverse order.

  -- by :user:MaelPic.

  Related issues and pull requests on GitHub: #1512.

Packaging updates and notes for downstreams

• Updated to use Cython 3.1 universally across the build path -- by :user:lysnikolaou.

  Related issues and pull requests on GitHub: #1514.

• Made Cython line tracing opt-in via the with-cython-tracing build config setting -- by :user:bdraco.

  Previously, line tracing was enabled by default in :file:pyproject.toml, which caused build issues for some users and made wheels nearly twice as slow. Now line tracing is only enabled when explicitly requested via pip install . --config-setting=with-cython-tracing=true or by setting the YARL_CYTHON_TRACING environment variable.

  Related issues and pull requests on GitHub: #1521.

---

Sourced from yarl's changelog.

1.20.1

(2025-06-09)

Bug fixes

• Started raising a :exc:ValueError exception raised for corrupted IPv6 URL values.

  These fixes the issue where exception :exc:IndexError was leaking from the internal code because of not being handled and transformed into a user-facing error. The problem was happening under the following conditions: empty IPv6 URL, brackets in reverse order.

  -- by :user:MaelPic.

  Related issues and pull requests on GitHub: :issue:1512.

Packaging updates and notes for downstreams

• Updated to use Cython 3.1 universally across the build path -- by :user:lysnikolaou.

  Related issues and pull requests on GitHub: :issue:1514.

• Made Cython line tracing opt-in via the with-cython-tracing build config setting -- by :user:bdraco.

  Previously, line tracing was enabled by default in :file:pyproject.toml, which caused build issues for some users and made wheels nearly twice as slow. Now line tracing is only enabled when explicitly requested via pip install . --config-setting=with-cython-tracing=true or by setting the YARL_CYTHON_TRACING environment variable.

  Related issues and pull requests on GitHub: :issue:1521.

---

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