{
  "id": "CVE-2026-45321",
  "url": "https://spydr.io/cve/CVE-2026-45321",
  "published": "2026-05-12T01:16:46.820Z",
  "modified": "2026-06-17T10:51:54.877Z",
  "score": 9.6,
  "severity": "critical",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
  "score_source": "github.com",
  "epss": 0.01054,
  "epss_percentile": 0.63188,
  "exploited": true,
  "kev": {
    "added": "2026-05-27",
    "due": "2026-06-10",
    "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.",
    "ransomware": "Known",
    "name": "TanStack Unspecified Vulnerability",
    "notes": "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"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "@tanstack"
  ],
  "products": [
    "@tanstack arktype-adapter",
    "@tanstack eslint-plugin-router",
    "@tanstack eslint-plugin-start",
    "@tanstack history",
    "@tanstack nitro-v2-vite-plugin",
    "@tanstack react-router",
    "@tanstack react-router-devtools",
    "@tanstack react-router-ssr-query",
    "@tanstack react-start",
    "@tanstack react-start-client",
    "@tanstack react-start-rsc",
    "@tanstack react-start-server",
    "@tanstack router-cli",
    "@tanstack router-core",
    "@tanstack router-devtools",
    "@tanstack router-devtools-core",
    "@tanstack router-generator",
    "@tanstack router-plugin",
    "@tanstack router-ssr-query-core",
    "@tanstack router-utils"
  ],
  "cwes": [
    "CWE-506"
  ],
  "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.",
  "status": "Analyzed",
  "score_type": "Secondary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 9.6,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://github.com/TanStack/router/issues/7383",
      "tags": [
        "Issue Tracking"
      ]
    },
    {
      "url": "https://github.com/TanStack/router/security/advisories/GHSA-g7cv-rxg3-hmpx",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://tanstack.com/blog/npm-supply-chain-compromise-postmortem",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://www.stepsecurity.io/blog/mini-shai-hulud-is-back-a-self-spreading-supply-chain-attack-hits-the-npm-ecosystem",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45321",
      "tags": [
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45321",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}