CVE-2026-45321
TanStack Unspecified Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 10 June 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 9.6 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- EPSS
- 2.34% probability · 83th percentile
- CISA KEV
- Listed 27 May 2026 · due 10 June 2026 · used in ransomware campaigns
- Weakness
- CWE-506
- Affected
- 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 · tanstack/tanstack\/router-devtools-core · tanstack/tanstack\/router-generator · tanstack/tanstack\/router-plugin · tanstack/tanstack\/router-ssr-query-core · tanstack/tanstack\/router-utils · +40 more
- Source
- security-advisories@github.com
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/TanStack/router/security/advisories/GHSA-g7cv-rxg3-hmpx ; https://nvd.nist.gov/vuln/detail/CVE-2026-45321
References
- https://github.com/TanStack/router/issues/7383Issue Tracking
- https://github.com/TanStack/router/security/advisories/GHSA-g7cv-rxg3-hmpxMitigation, Vendor Advisory
- https://tanstack.com/blog/npm-supply-chain-compromise-postmortemExploit, Vendor Advisory
- https://www.stepsecurity.io/blog/mini-shai-hulud-is-back-a-self-spreading-supply-chain-attack-hits-the-npm-ecosystemExploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45321US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.