Use of Persistent Cookies Containing Sensitive Information Affecting org.webjars.npm:undici package, versions [7.12.0,]
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-JAVA-ORGWEBJARSNPM-19635217
- published6 Sept 2026
- disclosed4 Sept 2026
- creditUnknown
Introduced: 4 Sep 2026
NewCVE-2026-84933 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
org.webjars.npm:undici is an An HTTP/1.1 client, written from scratch for Node.js
Affected versions of this package are vulnerable to Use of Persistent Cookies Containing Sensitive Information in the interceptors.cache() interceptor's shared-cache mode (type: 'shared'), which stores responses without excluding their Set-Cookie headers, contrary to RFC 6265 section 7.2. An attacker can have one user's cookie served to every subsequent caller matching the same cache key, or inject an upstream-supplied cookie into responses served to all callers, by getting a cacheable response that carries a Set-Cookie header cached. This requires the shared-cache mode, which is the default for the cache interceptor, with cacheable Set-Cookie responses from a multi-user or untrusted upstream, and private caches are unaffected.
Workaround
This vulnerability can be avoided by running the cache interceptor in private mode (type: 'private'), so per-user Set-Cookie responses are not shared across callers.