Improper Validation of Integrity Check Value Affecting undici package, versions >=7.15.0 <7.30.2>=8.0.0 <8.12.4
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-JS-UNDICI-22370261
- published8 Nov 2026
- disclosed6 Nov 2026
- creditalanprado1, Behruz Chilmatov
Introduced: 6 Nov 2026
NewCVE-2026-120423 (opens in a new tab)How to fix?
Upgrade undici to version 7.30.2, 8.12.4 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 Validation of Integrity Check Value via the fetch() function's Subresource Integrity verification logic, which splits the integrity string on a single space rather than on all ASCII whitespace characters. An integrity value whose digest is preceded by a horizontal tab or other non-space ASCII whitespace (e.g. \tsha256-...) is parsed as a single unrecognized token and skipped. When no recognized algorithm remains, the integrity list is treated as empty and the response is accepted unconditionally, allowing a server that returns a body different from the pinned digest to pass the check. An attacker who controls the response body can deliver arbitrary bytes to an application that uses whitespace-surrounded SRI metadata, with no integrity error raised.
Workaround
Supply SRI integrity metadata without surrounding whitespace, using a single space to separate multiple digests.