CVE-2016-5420: Debian Linux

High severity, CVSS 7.5. EPSS: 15.4% chance of exploitation in the next 30 days.

curl and libcurl before 7.50.1 do not check the client certificate when choosing the TLS connection to reuse, which might allow remote attackers to hijack the authentication of the connection by leveraging a previously created connection with a different client certificate.

Affected products

• Debian Debian Linux: version 8.0 only
• Haxx Libcurl: up to and including 7.50.0
• Opensuse Leap: version 42.1 only

Published 2016-08-10. Last modified 2026-06-17.