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Response snapshot Oct 31, 2026, 01:26 UTC

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VulnerabilityCVE-2026-119198

Nuxt dev server arbitrary file read through client error reports

A client that can connect to the dev server's HMR socket can send a nuxt:dev:client-error event whose message ends in an absolute file path.

At a glance

Exploited
Not known
Severity
5.9 Medium (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: @nuxt/vite-builder: 4.6.3. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-x287-wcfc-q46c (opens a new tab)

What happened

Summary

A client that can connect to the dev server's HMR socket can send a nuxt:dev:client-error event whose message ends in an absolute file path. The dev server reads that file while building the error report, and its contents are returned in the error overlay, on the dev error channel, and in the report shown in the terminal.

Impact

This affects the development server only; production builds contain none of this code. Affected versions are 4.6.0 to 4.6.2.

Continue reading

Reading the file requires TCP access to the dev server, so the default localhost bind limits this to local processes, which can usually read the same files directly. With the dev server exposed to a network (nuxt dev --host, nuxt dev --tunnel, or a proxy onto the dev port), anyone who can reach the port can read any file the dev process can read: SSH keys, .

env files, cloud credentials and other files outside the project. The same path is refused by Vite's server.fs allow list over /_nuxt/@fs/; the client error channel bypasses that check.

No user interaction is needed and no browser is involved: a plain WebSocket client is enough, as long as it does not send Sec-Fetch-Site: cross-site. A web page on another origin cannot retrieve the report: the overlay and channel endpoints reject browser requests from other origins.

Nuxt 3 is not affected.

Patches

Fixed in @nuxt/vite-builder 4.6.3, which nuxt 4.6.3 depends on. A client-reported error is no longer turned into a compile report, and report building for it no longer reads from the filesystem; file content now comes only from the dev server's module graph.

Workarounds

Do not expose the dev server to untrusted networks: keep the default localhost bind, and avoid nuxt dev --host, nuxt dev --tunnel and proxies onto the dev port. If the dev port was reachable from an untrusted network while a vulnerable version was running, treat any file readable by the dev process on that machine as exposed, and rotate credentials such as SSH keys and .env secrets.

Credits

Thanks to [@samsulselfut](https://github.com/samsulselfut) for the report.

Affected package ranges reported by GitHub: @nuxt/vite-builder: >= 4.6.0, < 4.6.3

Scores and how they were measured

CVSS base severity

5.9

Version 3.1As of

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

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-x287-wcfc-q46c (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-x287-wcfc-q46c, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 30). Nuxt dev server arbitrary file read through client error reports (CVE-2026-119198). https://kevwire.com/record/CVE-2026-119198

MLA

"Nuxt dev server arbitrary file read through client error reports (CVE-2026-119198)." KEVWire, 30 Oct. 2026, kevwire.com/record/CVE-2026-119198.

Chicago

KEVWire. "Nuxt dev server arbitrary file read through client error reports (CVE-2026-119198)." Last modified October 30, 2026. https://kevwire.com/record/CVE-2026-119198.

Evidence summary (plain text)

Nuxt dev server arbitrary file read through client error reports (Oct 30, 2026).
A client that can connect to the dev server's HMR socket can send a nuxt:dev:client-error event whose message ends in an absolute file path. The dev server reads that file while building the error report, and its contents are returned in the error overlay, on the dev error channel, and in the report shown in the terminal.

This affects the development server only; production builds contain none of this code. Affected versions are 4.6.0 to 4.6.2.
CVSS 5.9 (version 3.1; evidence as of Oct 30, 2026; https://github.com/advisories/GHSA-x287-wcfc-q46c).
Sources:
GitHub-reviewed advisory GHSA-x287-wcfc-q46c: https://github.com/advisories/GHSA-x287-wcfc-q46c
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-119198.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 31, 2026, 00:50 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

Record detail