What is CVE-2026-83601?

CVE-2026-83601 is a medium-severity vulnerability in Netdata, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2026-09-22.

How severe is CVE-2026-83601?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Netdata

CVE-2026-83601

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.

Vulnerability class: Integer Overflow

Published 2026-09-22 · last modified 2026-09-26.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (31.1th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Netdata — versions < 2.10.4

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-83601?: CVE-2026-83601 is a medium-severity vulnerability in Netdata, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2026-09-22.
How severe is CVE-2026-83601?: Medium severity. CVSS v3 base score is 6.5 out of 10.