{"id":"CVE-2026-58210","aliases":["BIT-nats-2026-58210","DEBIAN-CVE-2026-58210","EUVD-2026-42348","GHSA-r72h-j7qq-v6qg","JLSEC-2026-1147","RHSA-2026:36016","RHSA-2026:36017","UBUNTU-CVE-2026-58210"],"status":"published","title":"NATS Server: MQTT partial CONNECT packets can exhaust pre-auth memory","description":"NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.","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":"2026-11-10","score":0.00742,"percentile":0.55004,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400"],"published":"2026-07-08T20:13:37Z","modified":"2026-10-28T02:30:45Z","fixes":[{"ecosystem":"Bitnami","package":"nats","fixed_in":["2.12.12","2.14.3"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"nats-server","fixed_in":["2.14.3-1"],"sources":["osv"]},{"ecosystem":"Julia","package":"nats_server_jll","fixed_in":["2.14.3+0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"nats","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.12.12"},{"introduced":"2.14.0"},{"fixed":"2.14.3"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"nats-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.10.1-1","2.10.16-1","2.10.18-1","2.10.24-1","2.10.27-1","2.10.3-1","2.10.4-1","2.10.7-1","2.12.4-1","2.12.6-1","2.14.1-1","2.14.3-1","2.14.6-1","2.15.1-1","2.9.10-1","2.9.19-1"]},{"source":"osv","ecosystem":"Debian:13","package":"nats-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.10.27-1","2.12.4-1","2.12.6-1","2.14.1-1","2.14.3-1","2.14.6-1","2.15.1-1"]},{"source":"osv","ecosystem":"Debian:14","package":"nats-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.14.3-1"}]}],"versions":["2.10.27-1","2.12.4-1","2.12.6-1","2.14.1-1"]},{"source":"osv","ecosystem":"Julia","package":"nats_server_jll","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.14.3+0"}]}]},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"nats-server2.14","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:2.14.3-1.hum1"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"nats-server2.12","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:2.12.12-1.hum1"}]}],"bundled":6},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"nats-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.9.19-1build1","2.10.3-1","2.10.4-1","2.10.7-1","2.10.7-1ubuntu0.1","2.10.7-1ubuntu0.2","2.10.7-1ubuntu0.3"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"nats-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.10.24-1","2.10.27-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"nats-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.10.27-1build1","2.14.1-1","2.14.3-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:26.04:LTS","package":"nats-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.10.27-1","2.10.27-1build1","2.10.27-1ubuntu0.26.04.1~esm1"]}],"products":[{"vendor":"linuxfoundation","product":"nats-server"},{"vendor":"nats-io","product":"nats-server"}],"references":[{"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-r72h-j7qq-v6qg","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web","article","report"]},{"url":"https://github.com/nats-io/nats-server/commit/bce9ef39469e610aeddb819194ceb7f7edfc0861","tags":["x_refsource_MISC","Patch","fix","web","article"]},{"url":"https://github.com/nats-io/nats-server/commit/e016e47bbf70304945f2ae9dc397e4862adefaf5","tags":["x_refsource_MISC","Patch","fix","web","article"]},{"url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.12","tags":["x_refsource_MISC","Release Notes","article","web"]},{"url":"https://github.com/nats-io/nats-server/releases/tag/v2.14.3","tags":["x_refsource_MISC","Release Notes","article","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58210","tags":["web","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58210.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-58210","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:36016","tags":["advisory"]},{"url":"https://images.redhat.com/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-58213","tags":["report"]},{"url":"https://access.redhat.com/security/updates/classification/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-58210","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-58211","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-58209","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-58214","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-58254","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_36016.json","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2498259","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-58209","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58209","tags":["advisory"]},{"url":"https://github.com/nats-io/nats-server/commit/181b1f51f40b9954c57e9d478e051fb257679356","tags":["article"]},{"url":"https://github.com/nats-io/nats-server/commit/1c429b6fdc5afd4188cc5faf1127f6334896cd87","tags":["article"]},{"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-7qmq-8cc4-hxwg","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2498247","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-58210","tags":["advisory","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2498258","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-58211","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58211","tags":["advisory"]},{"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-hmmp-q8cx-v964","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2498249","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-58213","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58213","tags":["advisory"]},{"url":"https://github.com/nats-io/nats-server/commit/366837cfc65ab9ccb4f98193c65e8daf238582d8","tags":["article"]},{"url":"https://github.com/nats-io/nats-server/commit/64ebae40051ee497c481e10f316238faf0de1736","tags":["article"]},{"url":"https://github.com/nats-io/nats-server/commit/f14856b9e57a36818f43851cb69b6e33670885c9","tags":["article"]},{"url":"https://github.com/nats-io/nats-server/pull/8163","tags":["article"]},{"url":"https://github.com/nats-io/nats-server/pull/8164","tags":["article"]},{"url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.9","tags":["article"]},{"url":"https://github.com/nats-io/nats-server/releases/tag/v2.14.1","tags":["article"]},{"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-qrcv-3558-gj4f","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2498260","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-58214","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58214","tags":["advisory"]},{"url":"https://github.com/nats-io/nats-server/commit/297b166be60fe13144084eed4b25201ead03204a","tags":["article"]},{"url":"https://github.com/nats-io/nats-server/commit/34b09657bb596d5f850eaa5cfc97ea6b2f989a97","tags":["article"]},{"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-4g68-3pwx-5vfj","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2498266","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-58254","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58254","tags":["advisory"]},{"url":"https://github.com/nats-io/nats-server/commit/cbe845932980b71563efac5cfa4cc751c88936cd","tags":["article"]},{"url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.8","tags":["article"]},{"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-p3j5-5hrq-p75h","tags":["article"]},{"url":"https://access.redhat.com/errata/RHSA-2026:36017","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_36017.json","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-58210","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-58210","title":"NATS Server: MQTT partial CONNECT packets can exhaust pre-auth memory","description":"NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.","status":"published","published":"2026-07-08T20:13:37.082Z","modified":"2026-07-09T13:29:36.341Z","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-400"],"updated_at":"2026-11-02T13:47:28.691429Z"}],"euvd":[{"id":"EUVD-2026-42348","description":"NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. 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This issue is fixed in versions 2.14.3 and 2.12.12.","status":"published","published":"2026-07-08T20:16:53.95Z","modified":"2026-10-25T17:10:00.197Z","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-400"],"updated_at":"2026-11-02T14:12:28.4135Z"}],"osv":[{"id":"CVE-2026-58210","title":"NATS Server: MQTT partial CONNECT packets can exhaust pre-auth memory","description":"NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.","status":"published","published":"2026-07-08T20:13:37.082Z","modified":"2026-10-28T02:30:45.645948081Z","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-400"],"updated_at":"2026-11-02T15:45:12.016252Z"},{"id":"DEBIAN-CVE-2026-58210","description":"NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.","status":"published","published":"2026-07-08T20:16:53.95Z","modified":"2026-10-26T12:02:37.232315048Z","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":"2026-11-02T15:45:57.590991Z"},{"id":"JLSEC-2026-1147","description":"NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.","status":"published","published":"2026-08-03T19:08:57.739Z","modified":"2026-08-03T19:15:07.391845277Z","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":"2026-11-02T15:47:18.159338Z"},{"id":"RHSA-2026:36016","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","status":"published","published":"2026-08-22T10:22:44Z","modified":"2026-09-06T10:13:15Z","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":"2026-11-02T15:53:19.963895Z"},{"id":"RHSA-2026:36017","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","status":"published","published":"2026-08-22T10:22:45Z","modified":"2026-09-08T10:12:58Z","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":"2026-11-02T15:53:19.963895Z"},{"id":"UBUNTU-CVE-2026-58210","description":"NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. 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Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.","status":"published","published":"2026-07-14T15:47:12.837Z","modified":"2026-09-29T10:00:03.721899387Z","updated_at":"2026-11-02T15:28:34.007508Z"}]}}