{"id":"JLSEC-2026-1149","details":"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 authenticated MQTT client could subscribe to the internal `$MQTT.deliver.pubrel` subject family, bypassing configured subscribe permissions and exposing MQTT QoS2 protocol metadata for sessions in the account. This issue is fixed in versions 2.14.3 and 2.12.12.","modified":"2026-08-03T19:15:07.379754945Z","published":"2026-08-03T19:08:57.739Z","upstream":["CVE-2026-58214"],"database_specific":{"sources":[{"id":"CVE-2026-58214","imported":"2026-08-03T18:16:27.553Z","modified":"2026-07-13T15:17:13.573Z","published":"2026-07-08T20:16:54.347Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-58214","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58214","database_specific":{"status":"Analyzed"}}],"license":"CC-BY-4.0"},"references":[{"type":"WEB","url":"https://github.com/nats-io/nats-server/commit/297b166be60fe13144084eed4b25201ead03204a"},{"type":"WEB","url":"https://github.com/nats-io/nats-server/commit/34b09657bb596d5f850eaa5cfc97ea6b2f989a97"},{"type":"WEB","url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.12"},{"type":"WEB","url":"https://github.com/nats-io/nats-server/releases/tag/v2.14.3"},{"type":"WEB","url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-4g68-3pwx-5vfj"}],"affected":[{"package":{"name":"nats_server_jll","ecosystem":"Julia","purl":"pkg:julia/nats_server_jll?uuid=8b1691f7-6002-537d-bdf7-c6203599dc08"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.14.3+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1149.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"}]}