Netdata up to 2.10.3 Pluginsd Internals pluginsd_internals.h pluginsd_rrddim_put_to_slot/prd_array_create DIMENSION SLOT heap-based overflow

Summaryinfo

A vulnerability has been found in Netdata up to 2.10.3 and classified as very critical. This vulnerability affects the function pluginsd_rrddim_put_to_slot/prd_array_create of the file src/plugins.d/pluginsd_internals.h of the component Pluginsd Internals. This manipulation of the argument DIMENSION SLOT causes heap-based overflow. This vulnerability is registered as CVE-2026-83601. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as very critical was found in Netdata up to 2.10.3. Affected by this vulnerability is the function pluginsd_rrddim_put_to_slot/prd_array_create of the file src/plugins.d/pluginsd_internals.h of the component Pluginsd Internals. The manipulation of the argument DIMENSION SLOT with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-83601 since 08/31/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/22/2026).

Upgrading to version 2.10.4 eliminates this vulnerability. Applying the patch 2.10.0-782-nightly is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• Netdata

Version

• 2.10.0
• 2.10.1
• 2.10.2
• 2.10.3

Website

• Product: https://github.com/netdata/netdata/

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