CVE-2026-45321

Malware in 42 @tanstack/* packages exfiltrates cloud credentials, GitHub tokens, and SSH keys

CVSS 3.1 Critical 9.6Known exploited (CISA KEV)

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

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.

Key data

CVSS 3.1 Critical 9.6

Score published by GitHub_M in the CVE record.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Attack vector: Network
The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity: Low
No special conditions are needed. The attack can be repeated at will.
Privileges required: None
No account or privileges are needed.
User interaction: Required
A user has to do something first, such as opening a file or following a link.
Scope: Changed
The impact can reach other components beyond the vulnerable one.
Confidentiality impact: High
Serious or total effect on the secrecy of data.
Integrity impact: High
Serious or total effect on the trustworthiness of data.
Availability impact: High
Serious or total effect on availability.

Metric	Value	What it means
Attack vector	Network	The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity	Low	No special conditions are needed. The attack can be repeated at will.
Privileges required	None	No account or privileges are needed.
User interaction	Required	A user has to do something first, such as opening a file or following a link.
Scope	Changed	The impact can reach other components beyond the vulnerable one.
Confidentiality impact	High	Serious or total effect on the secrecy of data.
Integrity impact	High	Serious or total effect on the trustworthiness of data.
Availability impact	High	Serious or total effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score: 0.03278 (3.3% probability)
Percentile: 88.5%
Scores of: Nov 10, 2026
Model: v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.

Name in the catalog: TanStack Unspecified Vulnerability
Added to the catalog: May 27, 2026
Federal due date: Jun 10, 2026
Ransomware campaigns: Known use

CISA assessment as of May 27, 2026

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation: Recorded by CISA as active
Automatable: no
Technical impact: total

Weakness (CWE)

CWE catalog version 5.0.

CWE-506Embedded Malicious Code

Affected products

Products listed in the CVE record, as the CNA published them.

@tanstack arktype-adapter
- affected: 1.166.12
- affected: 1.166.15
@tanstack eslint-plugin-router
- affected: 1.161.9
- affected: 1.161.12
@tanstack eslint-plugin-start
- affected: 0.0.4
- affected: 0.0.7
@tanstack history
- affected: 1.161.9
- affected: 1.161.12
@tanstack nitro-v2-vite-plugin
- affected: 1.154.12
- affected: 1.154.15
@tanstack react-router
- affected: 1.169.5
- affected: 1.169.8
@tanstack react-router-devtools
- affected: 1.166.16
- affected: 1.166.19
@tanstack react-router-ssr-query
- affected: 1.166.15
- affected: 1.166.18
@tanstack react-start
- affected: 1.167.68
- affected: 1.167.71
@tanstack react-start-client
- affected: 1.166.51
- affected: 1.166.54
@tanstack react-start-rsc
- affected: 0.0.47
- affected: 0.0.50
@tanstack react-start-server
- affected: 1.166.55
- affected: 1.166.58
@tanstack router-cli
- affected: 1.166.46
- affected: 1.166.49
@tanstack router-core
- affected: 1.169.5
- affected: 1.169.8
@tanstack router-devtools
- affected: 1.166.16
- affected: 1.166.19
@tanstack router-devtools-core
- affected: 1.167.6
- affected: 1.167.9
@tanstack router-generator
- affected: 1.166.45
- affected: 1.166.48
@tanstack router-plugin
- affected: 1.167.38
- affected: 1.167.41
@tanstack router-ssr-query-core
- affected: 1.168.3
- affected: 1.168.6
@tanstack router-utils
- affected: 1.161.11
- affected: 1.161.14
@tanstack outer-vite-plugin
- affected: 1.166.53
- affected: 1.166.56
@tanstack solid-router
- affected: 1.169.5
- affected: 1.169.8
@tanstack solid-router-devtools
- affected: 1.166.16
- affected: 1.166.19
@tanstack solid-router-ssr-query
- affected: 1.166.15
- affected: 1.166.18
@tanstack solid-start
- affected: 1.167.65
- affected: 1.167.68
@tanstack solid-start-client
- affected: 1.166.50
- affected: 1.166.53
@tanstack solid-start-server
- affected: 1.166.54
- affected: 1.166.57
@tanstack start-client-core
- affected: 1.168.5
- affected: 1.168.8
@tanstack start-fn-stubs
- affected: 1.161.9
- affected: 1.161.12
@tanstack start-plugin-core
- affected: 1.169.23
- affected: 1.169.26
@tanstack start-server-core
- affected: 1.167.33
- affected: 1.167.36
@tanstack start-static-server-functions
- affected: 1.166.44
- affected: 1.166.47
@tanstack start-storage-context
- affected: 1.166.38
- affected: 1.166.41
@tanstack valibot-adapter
- affected: 1.166.12
- affected: 1.166.15
@tanstack virtual-file-routes
- affected: 1.161.10
- affected: 1.161.13
@tanstack vue-router
- affected: 1.169.5
- affected: 1.169.8
@tanstack vue-router-devtools
- affected: 1.166.16
- affected: 1.166.19
@tanstack vue-router-ssr-query
- affected: 1.166.15
- affected: 1.166.18
@tanstack vue-start
- affected: 1.167.61
- affected: 1.167.64
@tanstack vue-start-client
- affected: 1.166.46
- affected: 1.166.49
@tanstack vue-start-server
- affected: 1.166.50
- affected: 1.166.53
@tanstack zod-adapter
- affected: 1.166.12
- affected: 1.166.15

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

ID reservedMay 11, 2026
Record publishedMay 12, 2026
Added to CISA KEVMay 27, 2026
Record last updatedAug 4, 2026

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:09 UTC. Sources and licenses