curl Unbounded WebSocket PING Memory Exhaustion
CVE-2026-11586 Published on July 3, 2026

WS Auto-PONG memory exhaustion
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.

NVD

Vulnerability Analysis

CVE-2026-11586 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Products Associated with CVE-2026-11586

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Haxx Curl
 
Canonical Ubuntu Linux
 

Affected Versions

curl: