Allocation of Resources Without Limits or Throttling Affecting ws package, versions <8.21.1
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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- published16 Jul 2026
- disclosed15 Jul 2026
- creditUnknown
Introduced: 15 Jul 2026
NewCVE-2026-62389 (opens in a new tab)How to fix?
Upgrade ws to version 8.21.1 or higher.
Overview
ws is a simple to use websocket client, server and console for node.js.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through the receiver.js. An attacker can cause memory exhaustion by sending incomplete fragmented WebSocket messages, specifically by transmitting a text frame with FIN=0 followed by multiple continuation frames without completing the sequence, resulting in each fragment being stored as a separate Buffer object with significant overhead.