{"id":"CVE-2026-18916","aliases":["DEBIAN-CVE-2026-18916","EUVD-2026-66348","GHSA-m6mr-q7j3-3rc6","UBUNTU-CVE-2026-18916"],"status":"published","title":"Remote TCP DoS by throttling the TCP receive window","description":"Any remote client can crash a NSD serve child, by throttling the TCP receive window after a TCP query. By continuously crashing the serve childs, the remote client can denial all TCP service to this NSD instance.","severity":{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0046,"percentile":0.40316,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-191"],"published":"2026-08-26T08:39:12Z","modified":"2026-10-24T10:30:58Z","fixes":[{"ecosystem":"Debian:14","package":"nsd","fixed_in":["4.15.1-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"nsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.10.1-1","4.10.1~rc2-1","4.10.1~rc2-2","4.11.0-1","4.11.1-1","4.12.0-1","4.12.0-2","4.13.0-1","4.13.0-2","4.13.0-3","4.13.0-4","4.13.0-5","4.13.0-6","4.14.0-1","4.14.1-1","4.14.2-1","4.14.3-1","4.15.0-1","4.15.0~rc1-1","4.15.1-1","4.15.2-1","4.6.1-1","4.7.0-1","4.8.0-1","4.9.1-1"]},{"source":"osv","ecosystem":"Debian:13","package":"nsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.12.0-1","4.12.0-2","4.13.0-1","4.13.0-2","4.13.0-3","4.13.0-4","4.13.0-5","4.13.0-6","4.14.0-1","4.14.1-1","4.14.2-1","4.14.3-1","4.15.0-1","4.15.0~rc1-1","4.15.1-1","4.15.2-1"]},{"source":"osv","ecosystem":"Debian:14","package":"nsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.1-1"}]}],"versions":["4.12.0-1","4.12.0-2","4.13.0-1","4.13.0-2","4.13.0-3","4.13.0-4","4.13.0-5","4.13.0-6","4.14.0-1","4.14.1-1","4.14.2-1","4.14.3-1","4.15.0-1","4.15.0~rc1-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"nsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.2-1","4.1.6-1","4.1.7-1","4.1.7-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"nsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.16-1build1","4.1.17-1","4.1.17-1build1","4.1.17-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"nsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.26-1","4.1.26-1build1","4.1.26-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"nsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.5-1","4.3.7-1","4.3.8-1","4.3.8-1build1","4.3.9-1","4.3.9-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"nsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.7.0-1","4.8.0-1","4.8.0-1build1","4.8.0-1build3","4.8.0-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"nsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.14.0-1","4.14.2-1","4.14.3-1","4.15.0-1","4.15.0-1build1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:26.04:LTS","package":"nsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.12.0-1","4.13.0-6","4.14.0-1","4.14.0-1ubuntu0.1~esm1"]}],"products":[{"vendor":"nlnet labs","product":"nsd"},{"vendor":"nlnetlabs","product":"nsd"}],"references":[{"url":"https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-18916.txt","tags":["vendor-advisory","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18916"},{"url":"https://github.com/advisories/GHSA-m6mr-q7j3-3rc6"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-18916","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-18916","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-18916","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-18916","title":"Remote TCP DoS by throttling the TCP receive window","description":"Any remote client can crash a NSD serve child, by throttling the TCP receive window after a TCP query. By continuously crashing the serve childs, the remote client can denial all TCP service to this NSD instance.","status":"published","published":"2026-08-26T08:39:12.258Z","modified":"2026-08-26T14:22:31.309Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-191"],"updated_at":"2026-11-02T14:20:12.60856Z"}],"euvd":[{"id":"EUVD-2026-66348","description":"Any remote client can crash a NSD serve child, by throttling the TCP receive window after a TCP query. By continuously crashing the serve childs, the remote client can denial all TCP service to this NSD instance.","status":"published","published":"2026-08-26T08:39:12Z","modified":"2026-08-26T14:22:31Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T18:01:31.267984Z"}],"ghsa":[{"id":"GHSA-m6mr-q7j3-3rc6","title":"Any remote client can crash a NSD serve child, by throttling the TCP receive window after a TCP...","description":"Any remote client can crash a NSD serve child, by throttling the TCP receive window after a TCP query. By continuously crashing the serve childs, the remote client can denial all TCP service to this NSD instance.","status":"published","published":"2026-09-01T21:31:25Z","modified":"2026-09-08T21:32:40Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"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-191"],"updated_at":"2026-11-02T15:11:35.275364Z"}],"nvd":[{"id":"CVE-2026-18916","description":"Any remote client can crash a NSD serve child, by throttling the TCP receive window after a TCP query. By continuously crashing the serve childs, the remote client can denial all TCP service to this NSD instance.","status":"published","published":"2026-08-26T09:16:45.597Z","modified":"2026-09-08T20:00:51.85Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"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":"primary"}],"cwes":["CWE-191"],"updated_at":"2026-11-02T14:12:41.66469Z"}],"osv":[{"id":"CVE-2026-18916","description":"Any remote client can crash a NSD serve child, by throttling the TCP receive window after a TCP query. By continuously crashing the serve childs, the remote client can denial all TCP service to this NSD instance.","status":"published","published":"2026-08-26T09:16:45.597Z","modified":"2026-10-24T10:30:58.766747262Z","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":"2026-11-02T15:44:58.024074Z"},{"id":"DEBIAN-CVE-2026-18916","description":"Any remote client can crash a NSD serve child, by throttling the TCP receive window after a TCP query. By continuously crashing the serve childs, the remote client can denial all TCP service to this NSD instance.","status":"published","published":"2026-08-26T09:16:45.597Z","modified":"2026-10-01T03:02:55.311719697Z","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":"2026-11-02T15:45:53.097669Z"},{"id":"UBUNTU-CVE-2026-18916","description":"Any remote client can crash a NSD serve child, by throttling the TCP receive window after a TCP query. By continuously crashing the serve childs, the remote client can denial all TCP service to this NSD instance.","status":"published","published":"2026-08-26T09:16:00Z","modified":"2026-10-17T12:59:54.218154254Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"},{"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":"2026-11-02T16:56:01.334185Z"}]}}