Critical GitHub RCE Vulnerability CVE-2026-3854 Exposed Millions of Repositories to Cross-Tenant Access
Wiz researchers used AI-augmented reverse engineering to uncover CVE-2026-3854, a critical RCE flaw in GitHub’s internal git infrastructure that could have enabled any authenticated user to execute code on backend servers and access millions of private repositories. GitHub patched GitHub.com within hours, but 88% of self-hosted Enterprise Server instances remain unpatched.
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