Insertion of Sensitive Information Into Sent Data Affecting libcurl package, versions [7.76.0,8.23.0)
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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)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
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.