Exploited vulnerability · CISA KEV

Is CVE-2026-45321 exploited? Yes: in CISA KEV since 27 May 2026

Gociux · TanStack · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-45321, TanStack Unspecified Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 27 May 2026, 15 days after it was published. It is known to be used in ransomware campaigns. It affects TanStack. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What it is

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.

What to do

1. Check whether you run it. Look for TanStack in your asset inventory, including appliances and cloud images. Stack check lists every exploited TanStack CVE at once.
2. Apply the fix. 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. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 12 May 2026.
4. Get told next time. Email alerts when CISA adds a CVE for TanStack.

References

• nvd.nist.gov/vuln/detail/CVE-2026-45321

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in May 2026 · act-now radar.