Insufficient Verification of Data Authenticity Affecting undici package, versions >=7.0.0 <7.29.1>=8.0.0 <8.10.2
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-UNDICI-19635220
- published6 Sept 2026
- disclosed4 Sept 2026
- creditJoshua Rogers
Introduced: 4 Sep 2026
NewCVE-2026-85008 (opens in a new tab)How to fix?
Upgrade undici to version 7.29.1, 8.10.2 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 Insufficient Verification of Data Authenticity in the interceptors.cache() interceptor, whose skip-list construction subtracts the configured methods from the safe-method set instead of excluding the unsafe methods (POST, PUT, PATCH, DELETE), and whose canCacheResponse storage gate does not validate the method. An attacker can have a fabricated response served for later state-changing requests, which then never reach the origin, by returning from an untrusted origin a heuristically cacheable response such as a 404 that carries an explicit Cache-Control: max-age directive to an unsafe method. This applies under the default cache configuration (methods: ['GET']) and requires the origin to return a heuristically cacheable response bearing an explicit cache-control directive.