nonebot2 is a cross-platform Python asynchronous chatbot framework written in Python. This security advisory pertains to a potential information leak (e.g., environment variables) in instances where developers utilize `MessageTemplate` and incorporate user-provided data into templates. The identified vulnerability has been remedied in pull request #2509 and will be included in versions released from 2.2.0. Users are strongly advised to upgrade to these patched versions to safeguard against the vulnerability. A temporary workaround involves filtering underscores before incorporating user input into the message template.

GitHub, Inc. AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

GitHub, Inc. CWE-200

GitHub, Inc. https://github.com/nonebot/nonebot2/pull/2509 [No types assigned]

GitHub, Inc. https://github.com/nonebot/nonebot2/security/advisories/GHSA-59j8-776v-xxxg [No types assigned]