CVE-2026-19931
A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication, when the initial request is done using empty credentials. This can make user B's request get sent over user A's previously authenticated connection.
- Published Sep 6, 2026
- CVSS 9.8 critical
- 0.7% chance of exploitation in the next 30 days (EPSS)
- Public exploit code is available
- A fix is available