---
id: CVE-2026-63188
title: 'Logto is the modern, open-source auth infrastructure for SaaS and AI apps'
summary: >-
  Logto is the modern, open-source auth infrastructure for SaaS and AI apps.
  Prior to 0.3.9, the Logto Tunnel npm package enabled createStaticFileProxy
  from packages/tunnel/src/commands/tunnel/index.ts and passed request.url from
  static as…
severity: high
cwe:
  - CWE-22
vendor: logto
product: '@logto/tunnel'
affected:
  - '@logto/tunnel <= 0.3.8'
patched:
  - '@logto/tunnel 0.3.9'
published: '2026-08-19'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:15:59.613'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63188'
references:
  - url: >-
      https://github.com/logto-io/logto/commit/5686815955534f803d3d50738259efd0f741e62c
    label: security-advisories@github.com
  - url: 'https://github.com/logto-io/logto/pull/9113'
    label: security-advisories@github.com
  - url: 'https://github.com/logto-io/logto/releases/tag/@logto/tunnel@0.3.9'
    label: security-advisories@github.com
  - url: 'https://github.com/logto-io/logto/security/advisories/GHSA-rxjr-6c9q-h67x'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-rxjr-6c9q-h67x'
tags:
  - nvd
  - ghsa
  - npm
epss: 0.0054
epssPercentile: 0.4296
aliases:
  - GHSA-rxjr-6c9q-h67x
ecosystem: npm
ingestedAt: '2026-08-19T20:44:41.349Z'
---

## Overview

Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 0.3.9, the Logto Tunnel npm package enabled createStaticFileProxy from packages/tunnel/src/commands/tunnel/index.ts and passed request.url from static asset requests through packages/tunnel/src/commands/tunnel/utils.ts using path.join(staticPath, request.url) and then fs.open(requestPath, "r") without URL normalization or a containment check. When --experience-path was enabled and the tunnel port was reachable, an unauthenticated requester could send a path containing ../ to createStaticFileProxy and read files outside the configured static directory that were readable by the logto-tunnel process. The service used server.listen(port), which could expose the tunnel to other hosts depending on the platform and deployment. This issue is fixed in version 0.3.9.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-63188)

Affected packages:

- `@logto/tunnel <= 0.3.8`

Patched in:

- `@logto/tunnel 0.3.9`

Source: https://github.com/advisories/GHSA-rxjr-6c9q-h67x