{"id":"CVE-2026-83599","aliases":["DEBIAN-CVE-2026-83599","EUVD-2026-84561","GHSA-c8p4-cg3j-f4h2","UBUNTU-CVE-2026-83599"],"status":"published","title":"Netdata: WebSocket Decompression Bomb","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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00742,"percentile":0.55172,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-409"],"published":"2026-09-22T16:54:56Z","modified":"2026-10-28T11:12:31Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"netdata","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.37.1-2","1.38.0-1","1.38.1-1","1.39.0-1","1.39.1-1","1.39.1-2","1.40.0-1","1.40.0-2","1.40.1-1","1.41.0-1","1.42.0-1","1.42.1-1","1.42.2-1","1.42.3-1","1.42.4-1","1.43.0-1","1.43.1-1","1.43.2-1","1.44.3-1","1.44.3-2","1.46.3-1","1.46.3-2","1.47.0-1","1.47.1-1","1.47.2-1","1.47.5-1","2.0.3+dfsg-1","2.0.3+dfsg-2","2.0.3+dfsg-3","2.0.3+dfsg-4","2.0.3+dfsg-5"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"netdata","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.0+dfsg-1","1.8.0+dfsg-1","1.9.0+dfsg-1","1.9.0+dfsg-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"netdata","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.16.1-2","1.19.0-3ubuntu1","1.19.0-3ubuntu1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"netdata","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.29.3-4","1.31.0-4","1.33.1-1ubuntu1","1.33.1-1ubuntu1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"netdata","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.42.1-1","1.43.1-1","1.43.2-1","1.43.2-1build1","1.43.2-1build2"]}],"products":[{"vendor":"netdata","product":"netdata"}],"references":[{"url":"https://github.com/netdata/netdata/security/advisories/GHSA-c8p4-cg3j-f4h2","tags":["x_refsource_CONFIRM","advisory","report"]},{"url":"https://github.com/netdata/netdata/pull/22828","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/netdata/netdata/commit/e3811f7ee6e9fdfc4cbcb9929cab3f5d71d722d7","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/netdata/netdata/releases/tag/v2.11.0","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83599.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83599","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-83599","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-83599","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-83599","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-83599","title":"Netdata: WebSocket Decompression Bomb","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.","status":"published","published":"2026-09-22T16:54:56.419Z","modified":"2026-09-22T17:43:29.548Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-409"],"updated_at":"2026-11-02T13:45:02.910572Z"}],"euvd":[{"id":"EUVD-2026-84561","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.","status":"published","published":"2026-09-22T16:54:56Z","modified":"2026-09-22T17:43:29Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T17:28:02.149692Z"}],"nvd":[{"id":"CVE-2026-83599","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.","status":"published","published":"2026-09-22T17:17:25.957Z","modified":"2026-09-23T18:28:25.093Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-409"],"updated_at":"2026-11-02T14:12:50.368368Z"}],"osv":[{"id":"CVE-2026-83599","title":"Netdata: WebSocket Decompression Bomb","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.","status":"published","published":"2026-09-22T16:54:56.419Z","modified":"2026-10-28T11:12:31.983578082Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-409"],"updated_at":"2026-11-02T15:45:18.482949Z"},{"id":"DEBIAN-CVE-2026-83599","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.","status":"published","published":"2026-09-22T17:17:25.957Z","modified":"2026-09-24T08:47:33.855325642Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:46:04.577397Z"},{"id":"UBUNTU-CVE-2026-83599","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.","status":"published","published":"2026-09-22T17:17:00Z","modified":"2026-09-24T02:01:04.66954195Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:57:22.213888Z"}]}}