Allocation of Resources Without Limits or Throttling in cURL - CVE-2026-11586
Published: June 24, 2026
Vulnerability identifier: #VU135074
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-11586
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: curl.haxx.se
Affected software:
cURL
cURL
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in the WebSocket auto-PONG handling when processing rapid sequential WebSocket PING frames from a server. A remote attacker can send rapid sequential PING frames to cause a denial of service.
This issue affects both libcurl and the curl command line tool.
How to mitigate CVE-2026-11586
Install security update from vendor's website.