Netdata up to 2.10.x WebSocket Compression websocket-compression.c websocket_client_decompress_message allocation of resources

Summaryinfo

A vulnerability marked as critical has been reported in Netdata up to 2.10.x. Impacted is the function websocket_client_decompress_message of the file src/web/websocket/websocket-compression.c of the component WebSocket Compression. The manipulation leads to allocation of resources. This vulnerability is referenced as CVE-2026-83599. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Netdata up to 2.10.x. It has been rated as critical. This issue affects the function websocket_client_decompress_message of the file src/web/websocket/websocket-compression.c of the component WebSocket Compression. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. The summary by CVE is:

Netdata is an open source observability tool. Prior to 2.11.0, Netdata's unauthenticated WebSocket server negotiates permessage-deflate before authentication, and src/web/websocket/websocket-compression.c allows websocket_client_decompress_message() to grow decompressed output toward WS_MAX_DECOMPRESSED_SIZE without enforcing a compressed-to-decompressed ratio. Small highly compressed frames can therefore cause large server-side allocations, and repeated concurrent connections can exhaust memory and terminate monitoring. This vulnerability is fixed in 2.11.0.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-83599 since 08/31/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 2.11.0 eliminates this vulnerability.

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Productinfo

Name

• Netdata

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10

Website

• Product: https://github.com/netdata/netdata/

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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