CVE-2026-11586

A flaw was found in curl. A malicious server can exploit this vulnerability by sending rapid, sequential WebSocket PING messages. Due to a lack of an upper bound on memory allocation for unacknowledged frames, curl can be forced to exhaust all available memory, leading to a denial of service.

This Important denial of service vulnerability in curl allows a remote malicious server to exhaust system memory. By default, curl automatically responds to WebSocket PING frames without an upper bound on memory allocation, enabling an attacker to trigger resource exhaustion and cause service unavailability in affected Red Hat products.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.