CVE-2026-83603

In Netdata from 2.0.0 until 2.11.0, the /api/v3/settings endpoint is registered with HTTP_ACL_NOCHECK and HTTP_ACCESS_ANONYMOUS_DATA, allowing unauthenticated PUT requests to bypass operator-configured IP allow restrictions. An attacker 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.

In Netdata 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 without an upper bound. prd_array_create can then wrap the size_t allocation calculation while retaining the original large array size, causing the initialization loop to write beyond the undersized heap allocation and crash the parent agent.

In Netdata 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. 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.

Netdata prior to 2.11.0 contains a vulnerability in the unauthenticated WebSocket server that allows an attacker to send small highly compressed frames, leading to large server-side allocations and causing memory exhaustion and termination of monitoring.

Netdata from 2.0.0 to 2.10.4 contains a vulnerability during MSI repair where powershell.exe runs as SYSTEM without -NoProfile and loads the user's PowerShell profile, allowing commands placed in that profile to execute with SYSTEM privileges.

Reflected XSS vulnerability in Netdata before 2.3.1 in the api/v2/ilove.svg and api/v3/ilove.svg endpoints. An attacker can inject malicious JavaScript via the love parameter, which is reflected in the SVG response without proper encoding. The endpoints are accessible without authentication, allowing remote script execution in the victim's browser.