CVE-2026-45321: in the CISA KEV catalogue
TanStack Unspecified Vulnerability. CISA added CVE-2026-45321 to the Known Exploited Vulnerabilities catalogue on 2026-05-27 with a default due date of 2026-06-10. Known ransomware campaign use: Known. Forensic triage flag: No.
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 description)
- Vendor / product
- TanStack TanStack
- CWE
- Not listed
- CISA 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.
- EPSS
- 3.3%, percentile 88 (scored 2026-11-03)
EPSS puts about 3.3 in 100 odds (3.3%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 88% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2026-45321 in the CISA KEV catalogue?
Yes. CISA added CVE-2026-45321 (TanStack Unspecified Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2026-05-27. CISA's default due date for it is 2026-06-10.
Is CVE-2026-45321 used in ransomware attacks?
CISA marks known ransomware campaign use as Known for CVE-2026-45321.
What should I do about CVE-2026-45321?
CISA's 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.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2026-45321