CVE-2026-83599 Netdata: WebSocket Decompression Bomb
Attackers can exhaust server memory via WebSocket decompression bombs, causing denial of service in Netdata monitoring.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-83599?
CVE-2026-83599 is a high-severity denial of service vulnerability in netdata, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-409
Which versions are affected by CVE-2026-83599?
How do I fix CVE-2026-83599?
No fix has been published for CVE-2026-83599 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-83599 being exploited?
There is no known exploitation of CVE-2026-83599 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-83599, GHSA-c8p4-cg3j-f4h2, UBUNTU-CVE-2026-83599.