CVE-2026-83600

Netdata: Streaming protocol chart slot guard off-by-one allows ~16 GiB allocation request, crashing parent agent

6.5 Medium

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.55%Unchanged since Sep 23, 2026

What each source reports

CVE List Score used 6.5

Netdata: Streaming protocol chart slot guard off-by-one allows ~16 GiB allocation request, crashing parent agent

Record: CVE-2026-83600
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-193, CWE-400
Updated: 2026-11-02

EUVDEUVD-2026-84566 6.5

Record: EUVD-2026-84566
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

NVD 6.5

Record: CVE-2026-83600
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-193, CWE-400
Updated: 2026-11-02

OSV 6.5

Netdata: Streaming protocol chart slot guard off-by-one allows ~16 GiB allocation request, crashing parent agent

Record: CVE-2026-83600
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-193, CWE-400
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-83600 6.5

Record: DEBIAN-CVE-2026-83600
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-83600 6.5

Record: UBUNTU-CVE-2026-83600
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

netdata

Affected packages

Affected packages
Package	Affected	Fixed
`netdata` Debian:12	All versions, plus listed versions 1.37.1-21.38.0-11.38.1-11.39.0-11.39.1-1 Show 26 moreShow less 1.39.1-21.40.0-11.40.0-21.40.1-11.41.0-11.42.0-11.42.1-11.42.2-11.42.3-11.42.4-11.43.0-11.43.1-11.43.2-11.44.3-11.44.3-21.46.3-11.46.3-21.47.0-11.47.1-11.47.2-11.47.5-12.0.3+dfsg-12.0.3+dfsg-22.0.3+dfsg-32.0.3+dfsg-42.0.3+dfsg-5	None known
`netdata` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 1.7.0+dfsg-11.8.0+dfsg-11.9.0+dfsg-11.9.0+dfsg-1ubuntu0.1~esm1	None known
`netdata` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 1.16.1-21.19.0-3ubuntu11.19.0-3ubuntu1+esm1	None known
`netdata` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 1.29.3-41.31.0-41.33.1-1ubuntu11.33.1-1ubuntu1+esm1	None known
`netdata` Ubuntu:24.04:LTS	All versions, plus listed versions 1.42.1-11.43.1-11.43.2-11.43.2-1build11.43.2-1build2	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-83600 is a medium vulnerability (CVSS 6.5) in Netdata, published September 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.55%, the 46th percentile. No source names a fixed version.