Information Exposure Affecting undici package, versions >=7.0.0 <7.29.0>=8.0.0 <8.9.0
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-JS-UNDICI-18426521
- published30 Jul 2026
- disclosed29 Jul 2026
- credit@h0rk1p
Introduced: 29 Jul 2026
NewCVE-2026-13697 (opens in a new tab)How to fix?
Upgrade undici to version 7.29.0, 8.9.0 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 Information Exposure via the cache-control parser in lib/util/cache.js used by interceptors.cache(). An attacker can cause a private response to be stored in the shared cache, or terminate request handling, by sending malformed Cache-Control directives such as private="" or mixed private, private="hdr" values from an upstream response. In shared cache mode, a later request with the same cache key can receive another user's cached body and headers, including sensitive Set-Cookie data, and mixed qualified/unqualified private directives can raise an uncaught TypeError that aborts the request.