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. It has a CVSS v3.1 base score of 9.6 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

CVE-2026-45321 has a CVSS v3.1 score of 9.6 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.1705, placing it in the 1th percentile for exploitation probability.

CVE-2026-45321 affects products from tanstack, specifically: tanstack\/arktype-adapter, tanstack\/eslint-plugin-router, tanstack\/eslint-plugin-start, tanstack\/history, tanstack\/nitro-v2-vite-plugin, tanstack\/react-router, tanstack\/react-router-devtools, tanstack\/react-router-ssr-query, tanstack\/react-start, tanstack\/react-start-client, tanstack\/react-start-rsc, tanstack\/react-start-server, tanstack\/router-cli, tanstack\/router-core, tanstack\/router-devtools, tanstack\/router-devtools-core, tanstack\/router-generator, tanstack\/router-plugin, tanstack\/router-ssr-query-core, tanstack\/router-utils, tanstack\/router-vite-plugin, tanstack\/solid-router, tanstack\/solid-router-devtools, tanstack\/solid-router-ssr-query, tanstack\/solid-start, tanstack\/solid-start-client, tanstack\/solid-start-server, tanstack\/start-client-core, tanstack\/start-fn-stubs, tanstack\/start-plugin-core, tanstack\/start-server-core, tanstack\/start-static-server-functions, tanstack\/start-storage-context, tanstack\/valibot-adapter, tanstack\/virtual-file-routes, tanstack\/vue-router, tanstack\/vue-router-devtools, tanstack\/vue-router-ssr-query, tanstack\/vue-start, tanstack\/vue-start-client, tanstack\/vue-start-server, tanstack\/zod-adapter. Check the affected products table above for specific version ranges.

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.