CVE-2026-45321
9.6, critical Known exploited Used in ransomwareTanStack Unspecified Vulnerability
- CVSS
- 9.6, critical critical CVSS v3.1
- EPSS, next 30 days
- 1% higher than 63.7% of scored CVEs
- Exploitation
- Confirmed in the wild
- Published
- 12 May 20265 months ago
Known exploited
CISA added this to the Known Exploited Vulnerabilities Catalog on 27 May 2026 and links it to ransomware activity. US federal agencies had to remediate by 10 Jun 2026, a deadline that has passed.
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.
Details
- Vendor
- TanStack
- Product
- arktype-adapter
- Weakness
- CWE-506 (opens in a new tab)
- Status
- Analyzed
- Updated
- 17 Jun 2026
- Assigner
- security-advisories@github.com
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
References 5
Exploit code 2
Advisories 1
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Beyond this page
Is CVE-2026-45321 in your network?
This page tells you how dangerous CVE-2026-45321 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.
CVE-2026-45321 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.
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Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.