High · published July 3, 2026
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.
| Product | Versions | Fixed in |
|---|---|---|
| haxx/curl | ≥ 8.13.0, < 8.21.0 | 8.21.0 |