Sourced from multidict's releases.

6.6.2

Bug fixes

• Fixed a memory corruption issue in the C implementation of _md_shrink() that could lead to segmentation faults and data loss when items were deleted from a :class:~multidict.MultiDict. The issue was an edge case in the pointer arithmetic during the compaction phase -- by :user:bdraco.

  Related issues and pull requests on GitHub: #1221, #1222.

• Fixed format string compilation errors in debug builds on 32-bit platforms by using portable %zd format specifiers for Py_ssize_t values instead of %ld -- by :user:bdraco.

  Related issues and pull requests on GitHub: #1225, #1226.

Packaging updates and notes for downstreams

• Re-enabled 32-bit Linux wheel builds that were disabled by default in cibuildwheel 3.0.0 -- by :user:bdraco.

  Related issues and pull requests on GitHub: #1225, #1227.

---

6.6.1

Bug fixes

• If :meth:multidict.MultiDict.extend, :meth:multidict.MultiDict.merge, or :meth:multidict.MultiDict.update raises an exception, now the multidict internal state is correctly restored. Patch by :user:asvetlov.

  Related issues and pull requests on GitHub: #1215.

Contributor-facing changes

• Fixed setuptools deprecation warning about the license specification -- by :user:asvetlov.

  Related issues and pull requests on GitHub: #1216.

• Fix compiler warnings and convert them to errors -- by :user:asvetlov.

  Related issues and pull requests on GitHub: #1217.

... (truncated)

Sourced from multidict's changelog.

6.6.2

(2025-06-28)

Bug fixes

• Fixed a memory corruption issue in the C implementation of _md_shrink() that could lead to segmentation faults and data loss when items were deleted from a :class:~multidict.MultiDict. The issue was an edge case in the pointer arithmetic during the compaction phase -- by :user:bdraco.

  Related issues and pull requests on GitHub: :issue:1221, :issue:1222.

• Fixed format string compilation errors in debug builds on 32-bit platforms by using portable %zd format specifiers for Py_ssize_t values instead of %ld -- by :user:bdraco.

  Related issues and pull requests on GitHub: :issue:1225, :issue:1226.

Packaging updates and notes for downstreams

• Re-enabled 32-bit Linux wheel builds that were disabled by default in cibuildwheel 3.0.0 -- by :user:bdraco.

  Related issues and pull requests on GitHub: :issue:1225, :issue:1227.

---

6.6.1

(2025-06-28)

Bug fixes

• If :meth:multidict.MultiDict.extend, :meth:multidict.MultiDict.merge, or :meth:multidict.MultiDict.update raises an exception, now the multidict internal state is correctly restored. Patch by :user:asvetlov.

  Related issues and pull requests on GitHub: :issue:1215.

Contributor-facing changes

... (truncated)

• 8ea6942 Release 6.6.2 (#1224)
• 149c693 Fix format strings on 32bit platforms (#1226)
• ae6ed08 Restore building 32bit wheels on Linux (#1227)
• 17bbfd0 Fix pointer increment issue in _md_shrink causing memory corruption (#1222)
• 863eff1 Bump to 6.6.2.dev0 (#1220)
• ba4d428 Release 6.6.1 (#1219)
• 626d96c Fix compiler warnings, convert them to errors (#1217)
• 50a58d4 Restore multidict internal state on exception during updating (#1215)
• 0b046c9 Fix setuptools deprecation warning about the license (#1216)
• 97c0e94 Bump to 6.6.0.dev0 (#1214)
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