Authentication Bypass by Primary Weakness Affecting libcurl package, versions [7.76.0,8.19.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-15460438
- published11 Mar 2026
- disclosed11 Mar 2026
- creditMuhamad Arga Reksapati
Introduced: 11 Mar 2026
NewCVE-2026-3784 (opens in a new tab)How to fix?
Upgrade libcurl to version 8.19.0 or higher.
Overview
Affected versions of this package are vulnerable to Authentication Bypass by Primary Weakness in the url_match_proxy_use() function used by the CONNECT operation for an HTTP proxy connection. An attacker in control of an already-authenticated connection can authenticate using its credentials on a different proxy-authenticated connection.