Bug 2538486 (CVE-2026-83601)

Summary: CVE-2026-83601 netdata: Netdata: Denial of Service via oversized DIMENSION SLOT value
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Netdata. An authenticated child agent can send an oversized DIMENSION SLOT value. This oversized value can lead to an integer overflow during memory allocation, causing a subsequent write operation to go beyond the allocated buffer. This out-of-bounds write can crash the parent agent, resulting in a Denial of Service (DoS).
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Bug Depends On: 2539378    
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Description OSIDB Bzimport 2026-09-22 18:41:43 UTC 
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.