CVE-2026-83600 Netdata: Streaming protocol chart slot guard off-by-one allows ~16 GiB allocation request, crashing parent agent
An authenticated child agent can trigger a massive memory allocation in the parent Netdata agent, causing a crash and disabling centralized monitoring.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-83600?
CVE-2026-83600 is a medium-severity denial of service vulnerability in netdata, published on 22 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Netdata is an open source observability tool. Prior to 2.10.4, an authenticated child agent can send an oversized CHART SLOT value that str2ull_encoded passes to pluginsd_rrdset_cache_put_to_slot in src/plugins.d/pluginsd_internals.h. The accepted slot drives reallocz to request an approximately 16 GiB chart-pointer array, and allocation failure invokes fatal and aborts the parent Netdata agent, repeatedly disabling centralized monitoring while stream access persists. This issue is fixed in version 2.10.4 and nightly build 2.10.0-782-nightly.
Which versions are affected by CVE-2026-83600?
How do I fix CVE-2026-83600?
Upgrade to a fixed version.
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-2026-83600 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-83600 exists.
Sources
Also known as DEBIAN-CVE-2026-83600, GHSA-3mxw-fv2x-rhc6, MINI-7gc7-3v6v-6j59, MINI-xmch-g7gq-hrcp, UBUNTU-CVE-2026-83600.