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CRITICAL CISA KEV

CVE-2026-45321

CVSS v3

9.6

CRITICAL

EPSS Score

1.1 %

exploit probability, as of 2026-10-19

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • @tanstack/eslint-plugin-startnpmfrom 0.0.7 · fixed in 0.0.8
  • @tanstack/historynpmfrom 1.161.12 · fixed in 1.161.13and 2 other packages
  • @tanstack/nitro-v2-vite-pluginnpmfrom 1.154.15 · fixed in 1.154.16
  • @tanstack/react-startnpmfrom 1.167.71 · fixed in 1.167.72
  • @tanstack/react-start-clientnpmfrom 1.166.54 · fixed in 1.166.55
  • @tanstack/react-start-rscnpmfrom 0.0.50 · fixed in 0.0.51
  • @tanstack/react-start-servernpmfrom 1.166.58 · fixed in 1.166.59
  • @tanstack/router-clinpmfrom 1.166.49 · fixed in 1.166.50and 1 other package

20 more package ranges on OSV.dev

Full record on NVD

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.

CISA Known Exploited Vulnerability

Date Added
2026-05-27
Patch Due Date
2026-06-10
Ransomware Use
Unknown

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Published
2026-05-12

Frequently asked questions

What is CVE-2026-45321?

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.

Is CVE-2026-45321 actively exploited?

Yes. CVE-2026-45321 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-06-10.

What is the CVSS score for CVE-2026-45321?

CVE-2026-45321 has a CVSS v3 base score of 9.6 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

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