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CVE-2026-83602— Netdata: Unauthenticated remote PUT to /api/v3/settings bypasses IP allowlist controls via HTTP_ACL_NOCHECK

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 是一款开源的可观测性工具。从 2.0.0 版本到 2.11.0 版本，Netdata 在 中以 和 权限注册了 端点，导致由 处理的未认证 PUT 请求能够绕过管理员配置的“来自特定 IP 的仪表板访问限制”。任何网络可达的攻击者都可以将攻击者控制的 JSON 数据持久化写入 文件，操纵其版本计数器，并通过反复写入接近 20 MiB 的数据来消耗磁盘空间。尽管该文件并不控制数据采集或安全策略，但此行为仍构成安全与资源滥用风险。该漏洞已在 2.11.0 版本中修复。

CVSS 6.5 · Medium EPSS 0.36% · P30

Affected Version Matrix 1

VendorProduct Version RangeStatus
netdata netdata >= 2.0.0, < 2.11.0 affected
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I. Basic Information for CVE-2026-83602

Vulnerability Information
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Vulnerability Title
Netdata: Unauthenticated remote PUT to /api/v3/settings bypasses IP allowlist controls via HTTP_ACL_NOCHECK
Source: CVE Program / CVE List V5
Vulnerability Description
Netdata is an open source observability tool. From 2.0.0 until 2.11.0, Netdata registers /api/v3/settings in src/web/api/v3/web_api_v3.c with HTTP_ACL_NOCHECK and HTTP_ACCESS_ANONYMOUS_DATA, causing unauthenticated PUT requests handled by src/web/api/v3/api_v3_settings.c to bypass operator-configured allow dashboard from IP restrictions. A network-reachable caller 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, although the file does not control collection or security policy. 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:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
netdata netdata >= 2.0.0, < 2.11.0 -

II. Public POCs for CVE-2026-83602

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III. Intelligence Information for CVE-2026-83602

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Patches & Fixes for CVE-2026-83602 (2)

Other References for CVE-2026-83602 (1)

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-2026-83599 7.5 HIGH Netdata: WebSocket Decompression Bomb
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-2026-83600 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-284