post from github on May 20th, 2026:
We are sharing additional details regarding our investigation into unauthorized access to GitHub's internal repositories.
Yesterday we detected and contained a compromise of an employee device involving a poisoned VS Code extension. We removed the malicious extension version, isolated the endpoint, and began incident response immediately.
Our current assessment is that the activity involved exfiltration of GitHub-internal repositories only. The attacker鈥檚 current claims of ~3,800 repositories are directionally consistent with our investigation so far.