Improper Handling of Highly Compressed Data (Data Amplification) Affecting undici package, versions <6.24.0>=7.0.0-alpha.1 <7.24.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-UNDICI-15518068
- published13 Mar 2026
- disclosed12 Mar 2026
- creditUnknown
Introduced: 12 Mar 2026
NewCVE-2026-1526 (opens in a new tab)How to fix?
Upgrade undici to version 6.24.0, 7.24.0 or higher.
Overview
undici is an An HTTP/1.1 client, written from scratch for Node.js
Affected versions of this package are vulnerable to Improper Handling of Highly Compressed Data (Data Amplification) in the PerMessageDeflate.decompress() method of the permessage-deflate extension. An attacker can cause excessive memory usage by sending specially crafted compressed WebSocket frames that decompress to a very large size, potentially leading to process crashes or unresponsiveness.