Security flaws in automated workflows in the GitHub repository for Google’s Agent Development Kit for Python could allow public-facing AI agents to trigger more privileged automation, opening one path to manipulate pull-request reviews and another to expose credentials, according to a report from Pillar Security.
The first attack path involved a triage agent that analyzed pull requests submitted by external contributors. The agent posted its responses through adk-bot, an account with collaborator access to the repository. Pillar found that malicious instructions embedded in a pull request could induce the agent to post an “@gemini-cli” command, triggering a workflow intended for trusted users.
That workflow could enable command execution inside its CI runner. Its GitHub token could not push code, but it had write access to issues and pull requests. Pillar said those permissions could be used to alter a maintainer’s comment, submit an approving review as github-actions[bot], and remove a legitimate review request, making a malicious pull request appear ready to merge.
Pillar reproduced the first attack chain in its research environment. A maintainer still had to complete the merge, and the report said Google subsequently hardened the repository.
