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Vulnerability · Published Sep 22, 2026 · Assigned by GitHub_M

CVE-2026-83599Netdata: WebSocket Decompression Bomb

High 7.5

In plain English

A high-severity security flaw in netdata from netdata. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 45.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12netdatano fix listedDEBIAN-CVE-2026-83599
Ubuntu:24.04:LTSnetdatano fix listedUBUNTU-CVE-2026-83599

Affected products (as reported)

VendorProductVersions
netdata netdata < 2.11.0

Weakness: CWE-409 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References