TanStack Supply Chain Attack Lets Hackers Steal 170 Private CrowdSec GitHub Repositories

CrowdSec has disclosed that attackers copied about 170 private GitHub repositories after a former employee’s account was compromised through May’s TanStack npm supply chain attack. The May 22 theft remained undetected until stolen source code appeared on a cybercrime forum on September 16, showing how a poisoned dependency can outlive its infection window and undermine developer identities. Data Leak Claim The incident traces to CVE-2026-45321, the compromise of TanStack’s Router and Start ecosystem. On May 11, the threat actor chained an unsafe pull_request_target workflow, GitHub Actions cache poisoning, and runtime extraction of an OpenID Connect token to publish 84 malicious releases across 42 @tanstack...

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