CVE-2026-11586

What this means for your business

• It affects Haxx Curl. It matters if your company, or a supplier that handles your data, runs it.
• Code showing how to exploit it has been published, but real attacks have not been confirmed.
• An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
• FIRST's prediction model gives it a 0.6% chance of attack attempts being seen in the next 30 days, ranking above 47% of all known flaws.

What to do

1. 1Check whether your company or your suppliers run Haxx Curl, and which version. The affected versions are listed further down this page.
2. 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.