Vulnerability · Published Aug 19, 2026 · Assigned by GitHub_M
CVE-2026-63188logto-tunnel serves files outside --experience-path via path traversal
High 8.7
In plain English
A high-severity path traversal in logto from logto-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @logto/tunnel | 0.3.9 | GHSA-rxjr-6c9q-h67x |
Affected products (as reported)
Weakness: CWE-22 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/logto-io/logto/security/advisories/GHSA-rxjr-6c9q-h67x x_refsource_CONFIRM
- https://github.com/logto-io/logto/pull/9113 x_refsource_MISC
- https://github.com/logto-io/logto/commit/5686815955534f803d3d50738259efd0f741e62c x_refsource_MISC
- https://github.com/logto-io/logto/releases/tag/@logto/tunnel@0.3.9 x_refsource_MISC