{"id":"CVE-2026-83599","title":"Netdata is an open source observability tool","summary":"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_decompre…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-409"],"vendor":"netdata","product":"netdata","affected":["netdata < 2.11.0"],"published":"2026-09-22","updated":"2026-09-23","sourceUpdated":"2026-09-23T18:28:25.093","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-83599","references":[{"url":"https://github.com/netdata/netdata/commit/e3811f7ee6e9fdfc4cbcb9929cab3f5d71d722d7","label":"security-advisories@github.com"},{"url":"https://github.com/netdata/netdata/pull/22828","label":"security-advisories@github.com"},{"url":"https://github.com/netdata/netdata/releases/tag/v2.11.0","label":"security-advisories@github.com"},{"url":"https://github.com/netdata/netdata/security/advisories/GHSA-c8p4-cg3j-f4h2","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-83599.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-83599"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-83599"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00742,"epssPercentile":0.52815,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-22T17:36:21.063916Z"},"ingestedAt":"2026-09-22T17:07:07.378Z","slug":"CVE-2026-83599","body":"## Overview\n\nNetdata 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-83599.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}