CVE-2026-45321
Actively exploited. CVE-2026-45321 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-05-27) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2026-45321 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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.
CSIRTS triage
- What
- 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.
- Who is affected
- Users of TanStack who may have installed malicious versions from the npm registry.
- Urgency
- Remediation is urgent due to the exploitation status and the critical nature of the vulnerability.
- Action
- Users should remove any untrusted versions and monitor for updates from TanStack.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 82% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2026-45321 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2026-45321: TanStack Unspecified Vulnerabilitycisa-kev · 2026-05-27
External references
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[](https://www.csirts.com/cve/CVE-2026-45321)