CVE-2026-83601 Netdata: Streaming protocol dimension slot has no upper-bound guard, allowing integer overflow and out-of-bounds write
An authenticated child agent can trigger an integer overflow leading to an out-of-bounds write, crashing the parent agent or potentially executing code.
- 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-2026-83601?
CVE-2026-83601 is a medium-severity 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 DIMENSION SLOT value that str2ull_encoded passes to pluginsd_rrddim_put_to_slot in src/plugins.d/pluginsd_internals.h without an upper bound. prd_array_create in src/database/rrdset-pluginsd-array.h can then wrap the size_t allocation calculation while retaining the original large array size, causing the subsequent initialization loop to write beyond the undersized heap allocation and crash the parent agent. This issue is fixed in version 2.10.4 and nightly build 2.10.0-782-nightly.
Which versions are affected by CVE-2026-83601?
How do I fix CVE-2026-83601?
Upgrade to a fixed version.
Is CVE-2026-83601 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-83601 exists.
Sources
Also known as DEBIAN-CVE-2026-83601, GHSA-3qh4-842w-fvrm, MINI-fcj6-fxcp-xghc, MINI-vxhv-cghv-8hqh, UBUNTU-CVE-2026-83601.