Time-of-check Time-of-use (TOCTOU) Race Condition Affecting 9router package, versions <0.5.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-9ROUTER-17950956
- published11 Jul 2026
- disclosed10 Jul 2026
- creditUnknown
Introduced: 10 Jul 2026
NewCVE-2026-56676 (opens in a new tab)How to fix?
Upgrade 9router to version 0.5.2 or higher.
Overview
9router is a 9Router CLI - Start and manage 9Router server
Affected versions of this package are vulnerable to Time-of-check Time-of-use (TOCTOU) Race Condition through the image process in open-sse/translator/concerns/image.js. An attacker can access internal-only HTTP services by leveraging DNS rebinding with a vision-capable model and an attacker-controlled DNS name that initially resolves to a public IP and subsequently rebinds to an internal address. This is only exploitable if the attacker is authenticated and has access to the LLM proxy.