Insertion of Sensitive Information Into Sent Data Affecting libcurl package, versions [7.76.0,8.23.0)
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-CONAN-LIBCURL-21194668
- published18 Oct 2026
- disclosed14 Oct 2026
- creditUnknown
Introduced: 14 Oct 2026
NewCVE-2026-86414 (opens in a new tab)How to fix?
Upgrade libcurl to version 8.23.0 or higher.
Overview
Affected versions of this package are vulnerable to Insertion of Sensitive Information Into Sent Data in the tunnel process. An attacker can obtain sensitive authentication credentials by intercepting traffic through a malicious or compromised HTTP proxy server that responds with an HTTP 401 Unauthorized status code instead of a proxy authentication challenge. This is only exploitable if outbound traffic is routed through an untrusted or compromised HTTP proxy and the client transmits authentication data over a proxied tunnel.