[ruby-core:112544] [Ruby master Bug#19153] Since 2.7.7 CGI::Cookie raises ArgumentError when cookie domains is prefixed with a dot

Issue #19153 has been updated by nagachika (Tomoyuki Chikanaga).


Updated the bundled cgi to 0.3.6 on ruby_3_1 branch.

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Bug #19153: Since 2.7.7 CGI::Cookie raises ArgumentError when cookie domains is prefixed with a dot
https://bugs.ruby-lang.org/issues/19153#change-101989

* Author: cpinto (Celso Pinto)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 2.7.7p221 (2022-11-24 revision 168ec2b1e5) [arm64-darwin22]
* Backport: 2.7: REQUIRED, 3.0: REQUIRED, 3.1: DONE
----------------------------------------
The rspec tests of our Rails app started failing with an ArgumentError after upgrading to 2.7.7. On inspection, the issue seems to be caused by CGI::Cookie.domain=:

```
def domain=(str)
      if str and ((str = str.b).bytesize > 255 or !DOMAIN_VALUE_RE.match?(str))
        raise ArgumentError, "invalid domain: #{str.dump}"
      end
      @domain = str
    end
```

Setting a breakpoint:

0> str
=> ".example.com"

0> DOMAIN_VALUE_RE
=> /\A(?<label>(?!-)[-A-Za-z0-9]+(?<!-))(?:\.\g<label>)*\z/

0> DOMAIN_VALUE_RE.match?(str)
=> false

0> DOMAIN_VALUE_RE.match?('example.com')
=> true



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