high7.5
CVE-2026-11586
By default, curl automatically responds to WebSocket PING frames.
Impact
By default, curl automatically responds to WebSocket PING frames. Because curl lacks an upper bound on memory allocation for unacknowledged frames, a malicious server can exhaust all available memory by flooding curl with rapid, sequential PING messages.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Haxx | Curl | from 8.16.0 before 8.21.0 |