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CVE-2026-83599— Netdata: WebSocket Decompression Bomb

Quick assessment

Affected
netdata netdata
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netdata is an open source observability tool. Prior to 2.11.0, Netdata's unauthenticated WebSocket server negotiates permessage-deflate before authentication, and src/web/websocket/websocket-compression.c allows websocket_client_decompress_message() to grow de

CVSS 7.5 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
netdata netdata < 2.11.0 affected
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I. Basic Information for CVE-2026-83599

Vulnerability Information

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Vulnerability Title
Netdata: WebSocket Decompression Bomb
Source: CVE Program / CVE List V5
Vulnerability Description
Netdata is an open source observability tool. Prior to 2.11.0, Netdata's unauthenticated WebSocket server negotiates permessage-deflate before authentication, and src/web/websocket/websocket-compression.c allows websocket_client_decompress_message() to grow decompressed output toward WS_MAX_DECOMPRESSED_SIZE without enforcing a compressed-to-decompressed ratio. Small highly compressed frames can therefore cause large server-side allocations, and repeated concurrent connections can exhaust memory and terminate monitoring. This vulnerability is fixed in 2.11.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
netdata netdata < 2.11.0 -

II. Public POCs for CVE-2026-83599

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III. Intelligence Information for CVE-2026-83599

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Other References for CVE-2026-83599 (4)

Same Patch Batch · netdata · 2026-09-22 · 7 CVEs total

CVE-2026-83603 8.4 HIGH Netdata: Local Root via ndsudo Arbitrary socket_path → fail2ban-client Pickle RCE
CVE-2026-83598 7.8 HIGH Netdata: Local Privilege Escalation in Netdata Agent Windows installer via PowerShell Prof
CVE-2026-83597 7.0 HIGH Netdata: Local Privilege Escalation in Netdata Windows Agent installer via MSI Repair Exec
CVE-2026-83601 6.5 MEDIUM Netdata: Streaming protocol dimension slot has no upper-bound guard, allowing integer over
CVE-2026-83602 6.5 MEDIUM Netdata: Unauthenticated remote PUT to /api/v3/settings bypasses IP allowlist controls via
CVE-2026-83600 6.5 MEDIUM Netdata: Streaming protocol chart slot guard off-by-one allows ~16 GiB allocation request,

IV. Related Vulnerabilities

Same product: netdata
Same vendor: netdata
Same weakness: CWE-409

V. Comments for CVE-2026-83599

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