CVE-2026-45321 – Malware in 42 @tanstack/* packages exfiltrates cloud credentials, GitHub tokens, and SSH keys

CVE ID :CVE-2026-45321

Published : May 12, 2026, 1:16 a.m. | 41 minutes ago

Description :On 2026-05-11, between approximately 19:20 and 19:26 UTC, 84 malicious versions across 42 @tanstack/* packages were published to the npm registry. The publishes were authenticated via the legitimate GitHub Actions OIDC trusted-publisher binding for TanStack/router, but the publish workflow itself was not modified. The attacker chained three known vulnerability classes — a pull_request_target “Pwn Request” misconfiguration, GitHub Actions cache poisoning across the fork↔base trust boundary, and runtime memory extraction of the OIDC token from the Actions runner process — to publish credential-stealing malware under a trusted identity. Each affected package received exactly two malicious versions, published a few minutes apart.

Severity: 9.6 | CRITICAL

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