Vulnerability DatabaseCVE-2026-11586
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CVE-2026-11586
Published:June 24, 2026
Updated:June 24, 2026
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 Packages
https://github.com/curl/curl.git (GITHUB):
Affected version(s) >=curl-8_16_0 <curl-8_21_0
Fix Suggestion:
Update to version curl-8_21_0
Related Resources (1)
https://curl.se/docs/CVE-2026-11586.html
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW