Sourced from marshmallow's changelog.

3.26.2 (2025-12-19) ++++++++++++++++++

Bug fixes:

• :cve:CVE-2025-68480: Merge error store messages without rebuilding collections. Thanks 카푸치노 for reporting and :user:deckar01 for the fix.

3.26.1 (2025-02-03)

---

Bug fixes:

• Typing: Fix type annotations for class Meta <marshmallow.Schema.Meta> options (:issue:2804). Thanks :user:lawrence-law for reporting.

Other changes:

• Remove default value for the data param of Nested._deserialize <marshmallow.fields.Nested._deserialize> (:issue:2802). Thanks :user:gbenson for reporting.

3.26.0 (2025-01-22)

---

Features:

• Typing: Add type annotations and improved documentation for class Meta <marshmallow.Schema.Meta> options (:pr:2760).
• Typing: Improve type coverage of marshmallow.Schema.SchemaMeta (:pr:2761).
• Typing: marshmallow.Schema.loads parameter allows bytes and bytesarray (:pr:2769).

Bug fixes:

• Respect data_key when schema validators raise a ValidationError <marshmallow.exceptions.ValidationError> with a field_name argument (:issue:2170). Thanks :user:matejsp for reporting.
• Correctly handle multiple @post_load <marshmallow.post_load> methods where one method appends to the data and another passes pass_original=True (:issue:1755). Thanks :user:ghostwheel42 for reporting.
• URL fields now properly validate file paths (:issue:2249). Thanks :user:0xDEC0DE for reporting and fixing.

Documentation:

• Add :doc:upgrading guides <upgrading> for 3.24 and 3.26 (:pr:2780).
• Various documentation improvements (:pr:2757, :pr:2759, :pr:2765, :pr:2774, :pr:2778, :pr:2783, :pr:2796).

Deprecations:

• The ordered class Meta <marshmallow.Schema.Meta> option is deprecated (:issue:2146, :pr:2762). Field order is already preserved by default. Set marshmallow.Schema.dict_class to collections.OrderedDict

... (truncated)

• 1407d51 Merge pull request #2878 from marshmallow-code/3.x-mypy-unreachable
• b2292f5 Fix mypy errors
• 8acd211 Merge pull request #2877 from marshmallow-code/3.x-delint
• b4bcb4a [pre-commit.ci] auto fixes from pre-commit.com hooks
• b78af7a Delint
• 2c4451e Merge commit from fork
• 86d101a Bump version and update changelog
• 489a8d4 Only deep copy error message collections
• 6d4a17d Add test coverage for error message modification
• 0356a3f Merge error store messages without rebuilding collections
• Additional commits viewable in compare view

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