GeezerVison

Sourced from activesupport's releases.

8.1.4.1

Active Support

• ActiveSupport::MessagePack no longer deserializes an unsafe ActiveSupport::SafeBuffer as html_safe.

  A SafeBuffer that was no longer html_safe?, for example after an in-place gsub!, was deserialized as an html_safe SafeBuffer. It is now serialized with an unsafe marker and deserialized as a String. Earlier versions of Rails cannot read an unsafe buffer serialized this way.

  [GHSA-2w9f-fxwj-w2qf]

  Jean Boussier

• ActiveSupport::Inflector#safe_constantize matches the constant name in a LoadError message as a literal string instead of building a Regexp from it.

  The name's segments were interpolated unescaped into the pattern, so input that reaches safe_constantize, such as the channel identifier in an Action Cable subscribe command, chose the source passed to the regexp compiler.

  [GHSA-8474-xrp6-wh69]

  Jeremy Daer

Active Model

• No changes.

Active Record

• No changes.

Action View

• Skip attribute names in tag helpers that are blank once converted to a string.

  A Symbol such as :" " is not blank, because Symbol#blank? is Symbol#empty?, so it reached the escaping step and produced an attribute with no name. The asset helpers symbolize their keys, so an ordinary String key reached the same place.

  [GHSA-68p9-83h6-5wpj]

  Mike Dalessio

... (truncated)

Sourced from activesupport's changelog.

Rails 8.1.4.1 (November 03, 2026)

• ActiveSupport::MessagePack no longer deserializes an unsafe ActiveSupport::SafeBuffer as html_safe.

  A SafeBuffer that was no longer html_safe?, for example after an in-place gsub!, was deserialized as an html_safe SafeBuffer. It is now serialized with an unsafe marker and deserialized as a String. Earlier versions of Rails cannot read an unsafe buffer serialized this way.

  [GHSA-2w9f-fxwj-w2qf]

  Jean Boussier

• ActiveSupport::Inflector#safe_constantize matches the constant name in a LoadError message as a literal string instead of building a Regexp from it.

  The name's segments were interpolated unescaped into the pattern, so input that reaches safe_constantize, such as the channel identifier in an Action Cable subscribe command, chose the source passed to the regexp compiler.

  [GHSA-8474-xrp6-wh69]

  Jeremy Daer

• 3f290b7 Preparing for 8.1.4.1 release
• 4ca0906 ActiveSupport::MessagePack preserve SafeBuffer html_safe status
• 95aa9e4 Avoid dynamic regexp in safe_constantize LoadError handling
• See full diff in compare view

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