CVE-2026-9080: Haxx Curl

High severity, CVSS 7.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Calling `curl_easy_pause()` within the event-based `CURLMOPT_SOCKETFUNCTION` callback triggers a use-after-free vulnerability, where libcurl attempts to store a flag using a dangling struct pointer immediately after that pointer's memory has been freed.

Affected products

• Haxx Curl: from 8.13.0, before 8.21.0 (fixed in 8.21.0)

Published 2026-07-03. Last modified 2026-09-15.