CVE-2026-83602 Netdata: Unauthenticated remote PUT to /api/v3/settings bypasses IP allowlist controls via HTTP_ACL_NOCHECK
Unauthenticated attackers can bypass IP restrictions to modify settings files and exhaust disk space in Netdata.
- 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-2026-83602?
CVE-2026-83602 is a medium-severity missing authorization 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. From 2.0.0 until 2.11.0, Netdata registers /api/v3/settings in src/web/api/v3/web_api_v3.c with HTTP_ACL_NOCHECK and HTTP_ACCESS_ANONYMOUS_DATA, causing unauthenticated PUT requests handled by src/web/api/v3/api_v3_settings.c to bypass operator-configured allow dashboard from IP restrictions. A network-reachable caller can persist attacker-controlled JSON in {varlib}/settings/default.json, manipulate its version counter, and use repeated near-20 MiB writes to consume disk space, although the file does not control collection or security policy. This vulnerability is fixed in 2.11.0.
Weakness: CWE-284
Which versions are affected by CVE-2026-83602?
How do I fix CVE-2026-83602?
No fix has been published for CVE-2026-83602 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-83602 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-83602 exists.
Sources
Also known as DEBIAN-CVE-2026-83602, GHSA-8hjg-8hcf-fmwp, UBUNTU-CVE-2026-83602.