Package Instance

URI Credential Leakage Bypass over CVE-2025-27221
In affected URI version, a bypass exists for the fix to CVE-2025-27221 that can expose user credentials.

When using the `+` operator to combine URIs, sensitive information like passwords from the original URI can be leaked, violating RFC3986 and making applications vulnerable to credential exposure.

The vulnerability affects the `uri` gem bundled with the following Ruby series:

* 0.12.4 and earlier (bundled in Ruby 3.2 series)
* 0.13.2 and earlier (bundled in Ruby 3.3 series)
* 1.0.3 and earlier (bundled in Ruby 3.4 series)

URI allows for userinfo Leakage in URI#join, URI#merge, and URI#+
There is a possibility for userinfo leakage by in the uri gem.
This vulnerability has been assigned the CVE identifier CVE-2025-27221. We recommend upgrading the uri gem.

## Details

The methods `URI#join`, `URI#merge`, and `URI#+` retained userinfo, such as `user:password`, even after the host is replaced. When generating a URL to a malicious host from a URL containing secret userinfo using these methods, and having someone access that URL, an unintended userinfo leak could occur.

Please update URI gem to version 0.11.3, 0.12.4, 0.13.2, 1.0.3 or later.

## Affected versions

uri gem versions < 0.11.3, 0.12.0 to 0.12.3, 0.13.0, 0.13.1 and 1.0.0 to 1.0.2.

## Credits

Thanks to Tsubasa Irisawa (lambdasawa) for discovering this issue.
Also thanks to nobu for additional fixes of this vulnerability.