CVE-2026-45321

Known Exploited Vulnerability

TanStack Unspecified Vulnerability

Vendor / product: TanStack / TanStack

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.

Weakness classification

• CWE-506: Embedded Malicious Code

Primary references

• security-advisories@github.com — Issue Tracking
• security-advisories@github.com — Mitigation, Vendor Advisory
• security-advisories@github.com — Exploit, Vendor Advisory
• security-advisories@github.com — Exploit, Third Party Advisory
• 134c704f-9b21-4f2e-91b3-4a467353bcc0 — US Government Resource