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CVE-2026-45321

Critical 9.6 Exploited in the wild (KEV) Used in ransomware campaigns

Confirmed active exploitation — CISA KEV catalog

Name
TanStack Unspecified Vulnerability
Added to catalog
Remediation due date (US federal)
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.

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.

Metrics

CVSS 3.1
9.6 (CRITICAL) Score source: CNA CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
EPSS — exploit probability
3% (percentile: 88) as of 1 November 2026
CWE
CWE-506

Affected products

tanstack: tanstack\/arktype-adapter; tanstack: tanstack\/eslint-plugin-router; tanstack: tanstack\/eslint-plugin-start; tanstack: tanstack\/history; tanstack: tanstack\/nitro-v2-vite-plugin; tanstack: tanstack\/react-router; tanstack: tanstack\/react-router-devtools; tanstack: tanstack\/react-router-ssr-query; tanstack: tanstack\/react-start; tanstack: tanstack\/react-start-client; tanstack: tanstack\/react-start-rsc; tanstack: tanstack\/react-start-server; tanstack: tanstack\/router-cli; tanstack: tanstack\/router-core; tanstack: tanstack\/router-devtools

References