CVE-2026-11586 | Severity.io

Description

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.

Related CPE's

Vulnerable

References

https://curl.se/docs/CVE-2026-11586.html

PatchVendor Advisory

https://curl.se/docs/CVE-2026-11586.json

Vendor Advisory

https://hackerone.com/reports/3788931

ExploitIssue TrackingThird Party Advisory

Weaknesses

2499f714-1537-4658-8207-48ae4bb9eae9

Secondary

CWE-770

[email protected]

Primary

CWE-770

CVSS impact metrics

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

7.5 · High

Information

Source identifier

2499f714-1537-4658-8207-48ae4bb9eae9

Vulnerability status

Modified

Published

2026-07-03T07:16:23.883Z

3 months ago

Last modified

2026-09-15T07:16:25.700Z

3 weeks ago