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Vulnerability · CVE-2026-45321

TanStack Unspecified Vulnerability

Published May 11, 2026 · corrected/updated Jun 17, 2026 · TanStack TanStack · evidence confidence very high

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.

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2026-45321 is a critical public vulnerability record for TanStack TanStack. CISA lists it as known exploited. Published remediation guidance: 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 summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether TanStack TanStack is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: tanstack/tanstack/arktype-adapter (1.166.12); tanstack/tanstack/arktype-adapter (1.166.15); tanstack/tanstack/eslint-plugin-router (1.161.12); tanstack/tanstack/eslint-plugin-router (1.161.9). Published remediation guidance: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 9.6, EPSS 1.1%. CISA lists it as known exploited. Weakness classes: CWE-506. Sources contributing to this record: cisa_kev, cve_org, epss, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Confirmed in CISA KEV since May 27, 2026. Listed in CISA KEV and VulnCheck KEV.

  • Patch and remediation

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA due date Jun 10, 2026.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 11, 2026 · Catalog

    Detected

    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

  2. May 27, 2026 · CISA KEV

    Known exploited

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  3. Jun 10, 2026 · CISA KEV

    Remediation due

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  4. Jun 17, 2026 · Catalog

    Updated

    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

  5. Jun 17, 2026 · NIST NVD

    Updated

    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

Affected

  • cpe tanstack/tanstack/arktype-adapter1.166.12
  • cpe tanstack/tanstack/arktype-adapter1.166.15
  • cpe tanstack/tanstack/eslint-plugin-router1.161.12
  • cpe tanstack/tanstack/eslint-plugin-router1.161.9
  • cpe tanstack/tanstack/eslint-plugin-start0.0.4
  • cpe tanstack/tanstack/eslint-plugin-start0.0.7
  • cpe tanstack/tanstack/history1.161.12
  • cpe tanstack/tanstack/history1.161.9
  • cpe tanstack/tanstack/nitro-v2-vite-plugin1.154.12
  • cpe tanstack/tanstack/react-router1.169.5
  • cpe tanstack/tanstack/react-router-devtools1.166.16
  • cpe tanstack/tanstack/react-router-ssr-query1.166.15
  • vendor TanStack TanStackversion unspecified

Sources

  • CISA KEVConfirmed exploitationCVE-2026-45321

    TanStack contains an unspecified vulnerability that allowed malicious versions of the product to be published to the npm registry to publish credential-stealing malware under a trusted identity.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2026-45321

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-45321

    30-day exploitation probability 1.1%

    first.org
  • NIST NVDVulnerability recordCVE-2026-45321

    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 publis

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2026-45321

    TanStack contains an unspecified vulnerability that allowed malicious versions of the product to be published to the npm registry to publish credential-stealing malware under a trusted identity.

    vulncheck.com

References