{"id":"CVE-2026-83602","summary":"Netdata: Unauthenticated remote PUT to /api/v3/settings bypasses IP allowlist controls via HTTP_ACL_NOCHECK","details":"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.","aliases":["GHSA-8hjg-8hcf-fmwp"],"modified":"2026-09-24T08:26:11.816114Z","published":"2026-09-22T16:56:56.878Z","database_specific":{"cwe_ids":["CWE-284"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83602.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/netdata/netdata/releases/tag/v2.11.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83602.json"},{"type":"ADVISORY","url":"https://github.com/netdata/netdata/security/advisories/GHSA-8hjg-8hcf-fmwp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83602"},{"type":"FIX","url":"https://github.com/netdata/netdata/commit/0124f50bbcf36c23e798e2b76f021f5032ec93d4"},{"type":"FIX","url":"https://github.com/netdata/netdata/pull/22896"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/netdata/netdata","events":[{"introduced":"92b67c5bfd8ee40b4443ce3911608a2d91a50a24"},{"fixed":"0124f50bbcf36c23e798e2b76f021f5032ec93d4"},{"fixed":"bb8f509e99cad230d3acc1fdfc840224f3b3db3a"}],"database_specific":{"extracted_events":[{"introduced":"2.0.0"},{"fixed":"2.11.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v2.10.0","v2.9.0","v2.8.0","v2.7.0","v2.6.0","v2.5.0","v2.4.0","v2.3.0","v2.2.0","v2.1.0","v2.0.0"],"database_specific":{"vanir_signatures_modified":"2026-09-24T08:26:11Z","vanir_signatures":[{"target":{"file":"src/web/api/web_api_v3.c"},"deprecated":false,"digest":{"line_hashes":["140032258092207825914538942930511512171","188182553303030436199424371261900096189","150771813883890436116221791519646158586","121082196633926126176061243272209717734"],"threshold":0.9},"id":"CVE-2026-83602-44f707e1","signature_type":"Line","signature_version":"v1","source":"https://github.com/netdata/netdata/commit/0124f50bbcf36c23e798e2b76f021f5032ec93d4"}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-83602.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"}]}