Directory Traversal Affecting langfuse-4 package, versions <4.32.0-r3


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.38% (31st percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-LANGFUSE4-19786926
  • published15 Sept 2026
  • disclosed1 Sept 2026

Introduced: 1 Sep 2026

NewCVE-2026-84373  (opens in a new tab)
CWE-22  (opens in a new tab)

How to fix?

Upgrade Chainguard langfuse-4 to version 4.32.0-r3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream langfuse-4 package and not the langfuse-4 package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

Vitest is a testing framework powered by Vite. From 2.1.0 until 4.1.11 and 5.0.0-rc.2, the public mockerPlugin and standalone interceptorPlugin exports in packages/mocker/src/node/interceptorPlugin.ts register the vitest:interceptor:register handler on Vite's unauthenticated HMR WebSocket without validating redirect targets against the file-serving allowlist. The implementation processes event.redirect without enforcing server.fs.allow and server.fs.deny through isFileLoadingAllowed. A remote client that can reach an exposed development server can submit an opaque URL scheme preserving .. segments, causing join(server.config.root, redirectUrl.pathname) to resolve outside the project root. The plugin's load hook then returns readFile(mock.redirect, 'utf-8') as module source, disclosing local files readable by the dev-server process. Vitest browser mode uses a token-authenticated RPC and is not remotely unauthenticated by default, although the same boundary check was missing on that path. This issue is fixed in versions 4.1.11 and 5.0.0-rc.2.

CVSS Base Scores

version 3.1