HTTP Request Smuggling Affecting nghttp2/nghttp2 package, versions [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.
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-UNMANAGED-NGHTTP2NGHTTP2-17669875
- published29 Jun 2026
- disclosed28 Jun 2026
- creditUnknown
Introduced: 28 Jun 2026
NewCVE-2026-58055 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
Affected versions of this package are vulnerable to HTTP Request Smuggling in the handling of HTTP/1.1 Upgrade requests containing a Content-Length header and body on reusable keep-alive backend connections. An attacker can manipulate backend responses by crafting ambiguous HTTP messages, potentially causing cross-client response-queue poisoning or unauthorized access to sensitive data.