tanstack arktype-adapter malicious code

Summaryinfo

A vulnerability classified as critical was found in tanstack arktype-adapter, eslint-plugin-router, eslint-plugin-start, history, nitro-v2-vite-plugin, react-router, react-router-devtools, react-router-ssr-query, react-start, react-start-client, react-start-rsc, react-start-server, router-cli, router-core, router-devtools, router-devtools-core, router-generator, router-plugin, router-ssr-query-core, router-utils, outer-vite-plugin, solid-router, solid-router-devtools, solid-router-ssr-query, solid-start, solid-start-client, solid-start-server, start-client-core, start-fn-stubs, start-plugin-core, start-server-core, start-static-server-functions, start-storage-context, valibot-adapter, virtual-file-routes, vue-router, vue-router-devtools, vue-router-ssr-query, vue-start, vue-start-client, vue-start-server and zod-adapter. Affected by this issue is some unknown functionality. The manipulation results in malicious code. This vulnerability is known as CVE-2026-45321. It is possible to launch the attack remotely. Furthermore, an exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in tanstack arktype-adapter, eslint-plugin-router, eslint-plugin-start, history, nitro-v2-vite-plugin, react-router, react-router-devtools, react-router-ssr-query, react-start, react-start-client, react-start-rsc, react-start-server, router-cli, router-core, router-devtools, router-devtools-core, router-generator, router-plugin, router-ssr-query-core, router-utils, outer-vite-plugin, solid-router, solid-router-devtools, solid-router-ssr-query, solid-start, solid-start-client, solid-start-server, start-client-core, start-fn-stubs, start-plugin-core, start-server-core, start-static-server-functions, start-storage-context, valibot-adapter, virtual-file-routes, vue-router, vue-router-devtools, vue-router-ssr-query, vue-start, vue-start-client, vue-start-server and zod-adapter. Affected is an unknown function. The manipulation with an unknown input leads to a malicious code vulnerability. CWE is classifying the issue as CWE-506. The product contains code that appears to be malicious in nature. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-45321 since 05/11/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are unknown but an exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/02/2026).

It is declared as attacked. This issue was added on 05/27/2026 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 06/10/2026:

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at CNNVD (CNNVD-202605-2954). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Router Operating System

Vendor

• tanstack

Name

• arktype-adapter
• eslint-plugin-router
• eslint-plugin-start
• history
• nitro-v2-vite-plugin
• outer-vite-plugin
• react-router
• react-router-devtools
• react-router-ssr-query
• react-start
• react-start-client
• react-start-rsc
• react-start-server
• router-cli
• router-core
• router-devtools
• router-devtools-core
• router-generator
• router-plugin
• router-ssr-query-core
• router-utils
• solid-router
• solid-router-devtools
• solid-router-ssr-query
• solid-start
• solid-start-client
• solid-start-server
• start-client-core
• start-fn-stubs
• start-plugin-core
• start-server-core
• start-static-server-functions
• start-storage-context
• valibot-adapter
• virtual-file-routes
• vue-router
• vue-router-devtools
• vue-router-ssr-query
• vue-start
• vue-start-client
• vue-start-server
• zod-adapter

CPE 2.3info

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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