CVE-2026-11586

WS Auto-PONG memory exhaustion

Published Jul 3, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Ubuntu USN Ubuntu USN USN-8525-1 curl vulnerabilities
History
Type Values Removed Values Added
Weaknesses CWE-789
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-789
Type Values Removed Values Added
Weaknesses CWE-789
Type Values Removed Values Added
Weaknesses CWE-789
Type Values Removed Values Added
Weaknesses CWE-789
Type Values Removed Values Added
Weaknesses CWE-789
Type Values Removed Values Added
Weaknesses CWE-399
CWE-400
Type Values Removed Values Added
Weaknesses CWE-399
CWE-400
Type Values Removed Values Added
Weaknesses CWE-789
Type Values Removed Values Added
Weaknesses CWE-789
Type Values Removed Values Added
First Time appeared Curl
Curl curl
Vendors & Products Curl
Curl curl
Type Values Removed Values Added
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.
Title WS Auto-PONG memory exhaustion
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
curl
Published
Updated
Sep 15, 2026, 6:02 AM
Reserved
Jun 8, 2026, 12:17 PM
Status
Modified
Published
Jul 3, 2026, 7:16 AM
Modified
Sep 15, 2026, 7:16 AM
Severity
Important
Public date
Jul 3, 2026, 6:13 AM