{"id":"GHSA-2x6f-57hp-86fx","revision":null,"records":[{"revision":"e57e0d7f42ca4d0e8ac88984ca570a82","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-56301","aliases":[],"title":"Nuxt - Arbitrary File Read via World-Connectable vite-node IPC Socket on Linux","description":"Nuxt 4.0.0 before 4.4.7 and 3.18.0 before 3.21.7, when running the development server (nuxt dev) on Linux, binds the vite-node IPC server to an abstract-namespace Unix socket without permission restrictions, allowing local users to enumerate and connect. Unprivileged co-resident users can exploit the unprotected module request handler to read arbitrary files such as .env and SSH keys through the SSR plugin pipeline. 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Abstract sockets have no filesystem inode and therefore no permission bits: any local UID on the host that can read `/proc/net/unix` can enumerate the socket and connect to it.\n\nThe IPC server does not perform any peer-credential or shared-secret check before dispatching requests. The `module` request type passes its `moduleId` field straight into Vite's SSR `fetchModule()`, which is not gated by Vite's HTTP-layer `server.fs.allow` deny-list. A co-resident unprivileged local user can therefore request paths like `/home/<dev>/project/.env?raw` or `~/.ssh/id_rsa?raw` and read the developer's secrets through the dev server's SSR plugin pipeline. The `resolve` request type additionally enables filesystem probing.\n\nThis affects developers running `nuxt dev` on shared multi-tenant Linux hosts (lab machines, shared bastions, CI runners shared between jobs without per-job container isolation). It does not affect:\n\n- Production builds (`nuxt build` / `nuxt start`). The IPC server only runs in development.\n- macOS or Windows developers.\n- Docker / StackBlitz environments, which already fall back to a filesystem socket.\n- Single-user laptops or per-job containerised CI.\n\n### Patches\n\nFixed in `nuxt@4.4.7` (commit [`1f9f4767`](https://github.com/nuxt/nuxt/commit/1f9f4767a8725104da9bee872bb8d35246f25ae5)) and backported to `nuxt@3.21.7` (commit [`c293bf95`](https://github.com/nuxt/nuxt/commit/c293bf9503ccb3bc9559bff4a1f592f99063c9ea)).\n\nThe fix removes the abstract-namespace branch entirely. The IPC server now always binds to a filesystem Unix socket under the OS temp directory and explicitly `chmod 0600`s it after `listen()`, restricting connections to the owning UID. If the chmod fails for any reason, the server closes rather than serve requests on an unrestricted channel.\n\n### Workarounds\n\nIf you cannot upgrade immediately on an affected host:\n\n- Run `nuxt dev` inside a container or VM with no other tenants. Docker already triggers the filesystem-socket fallback in vulnerable versions and that fallback is unaffected.\n- Bind the dev process to a single-user namespace (`unshare -U`, rootless containers).\n- Restrict `/proc/net/unix` visibility via `hidepid=2` mount options where applicable, though this is partial mitigation only.\n\n### References\n\n- Affected file: `packages/vite/src/plugins/vite-node.ts`\n- CWE-276: Incorrect Default Permissions\n\n### Credit\n\nReported by Anthropic / Claude as part of Anthropic's coordinated vulnerability disclosure programme, reference ANT-2026-MSNKZFAT. Thanks to the Anthropic security team for the report and the detailed reproduction.\n\nIndependently reported by [@alcls01111](https://github.com/alcls01111) via GitHub's coordinated disclosure flow (`GHSA-5gvc-46gq-948j`), closed as a duplicate of this advisory.","state":0,"publishedAt":"2026-06-16T13:49:10+00:00","modifiedAt":"2026-09-23T21:45:07.9905363+00:00","affected":[{"ecosystem":"npm","name":"nuxt","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"4.0.0"},{"kind":"fixed","version":"4.4.7"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"nuxt","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"3.18.0"},{"kind":"fixed","version":"3.21.7"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/nuxt/nuxt/security/advisories/GHSA-534h-c3cw-v3h9","https://nvd.nist.gov/vuln/detail/CVE-2026-56301","https://github.com/nuxt/nuxt/commit/1f9f4767a8725104da9bee872bb8d35246f25ae5","https://github.com/nuxt/nuxt/commit/c293bf9503ccb3bc9559bff4a1f592f99063c9ea","https://github.com/nuxt/nuxt","https://www.vulncheck.com/advisories/nuxt-arbitrary-file-read-via-world-connectable-vite-node-ipc-socket-on-linux"],"sourceUrl":"https://github.com/advisories/GHSA-534h-c3cw-v3h9","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-534h-c3cw-v3h9","identifiers":["GHSA-534h-c3cw-v3h9","CVE-2026-56301"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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