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CVE-2026-45321

TanStack Unspecified Vulnerability

TanStack TanStack CWE-506

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.

CVSS Score
9.6
Critical
EPSS — Exploit Probability
17%
Riskier than 95% of all CVEs
Exploitation
Confirmed in the wild
Used in ransomware campaigns
Remediation
Patch available
Federal deadline 2026-06-10
CISA required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Deadline for federal agencies: 2026-06-10.

NVD entry Vendor patch PoC / advisory CISA KEV

9 articles across 5 outlets · first covered May 12, 2026 · latest May 28, 2026

Associated threat actors

TeamPCP

Coverage timeline