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The commit diff shows a critical change in client.py where error message handling was modified from 'self._error_message = msg.args' to 'self.add_error_message(' '.join(msg.args))'. This indicates the original code failed to properly escape user-controlled input from the Referer header when generating error pages. The CVE description explicitly references Referer header XSS, and the patch adds proper message escaping through add_error_message.
| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| roundup | pip | < 2.4.0 | 2.4.0 |
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