critical Known exploitedREV. 01
CVE-2026-45321TanStack — 84 malicious npm versions under a trusted identity
On 11 May 2026 an attacker chained a workflow misconfiguration, build-cache poisoning and token theft to publish 84 malicious versions across 42 TanStack packages to npm, signed off by the project's own trusted-publisher identity.
Read the risk
THE VITAL STATS- CVSS score
- 9.6/ 10 CVSS v3.1
- EPSS probability
- 2% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2026-05-12
- Added to KEV
- 2026-05-27
- Exploit published
- Yes
- Confidence
- high
- Kill chain
- initial access
- MITRE ATT&CK
- —
- Severity
- critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Attacker needsThe victim installed a TanStack package during the few minutes the malicious versions were on npm.
Behind the card
5 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisorygithub.comgithub.com
- 04Exploittanstack.comtanstack.com
- 05Exploitstepsecurity.iostepsecurity.io
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-24 | claude-code | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.