{"id":"CVE-2026-58214","summary":"NATS Server: MQTT subscribe ACL bypass via $MQTT.deliver.pubrel prefix (incomplete fix for CVE-2026-33217)","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.","aliases":["GHSA-4g68-3pwx-5vfj"],"modified":"2026-07-11T03:53:35.968314797Z","published":"2026-07-08T20:06:34.794Z","database_specific":{"cna_assigner":"GitHub_M","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58214.json","cwe_ids":["CWE-863"]},"references":[{"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":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58214.json"},{"type":"ADVISORY","url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-4g68-3pwx-5vfj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58214"},{"type":"FIX","url":"https://github.com/nats-io/nats-server/commit/297b166be60fe13144084eed4b25201ead03204a"},{"type":"FIX","url":"https://github.com/nats-io/nats-server/commit/34b09657bb596d5f850eaa5cfc97ea6b2f989a97"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nats-io/nats-server","events":[{"introduced":"0"},{"introduced":"da6b158496e4ef505087642e0258c0e2e1e38567"},{"fixed":"e8de2a67c7a094abca6013931ecf6cbff4b3fb02"},{"fixed":"9b17a586be69c9ff36e4c84a421ca47da410b561"},{"fixed":"297b166be60fe13144084eed4b25201ead03204a"},{"fixed":"34b09657bb596d5f850eaa5cfc97ea6b2f989a97"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.12.12"},{"introduced":"2.14.0-RC.1"},{"fixed":"2.14.3"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v2.14.2","v2.12.11","v2.12.10","v2.12.10-RC.1","v2.14.2-RC.1","v2.14.1","v2.12.9","v2.14.1-RC.2","v2.12.9-RC.2","v2.14.1-RC.1","v2.12.9-RC.1","v2.12.8","v2.14.0","v2.12.7","v2.14.0-RC.3","v2.14.0-RC.2","v2.14.0-RC.1","v2.12.4","v2.12.6","v2.12.5","v2.12.5-RC.2","v2.12.5-RC.1","v2.12.4-RC.6","v2.12.4-RC.5","v2.12.4-RC.4","v2.12.2","v2.12.4-RC.3","v2.12.4-RC.2","v2.12.4-RC.1","v2.12.3","v2.12.3-RC.5","v2.12.3-RC.4","v2.12.3-RC.3","v2.12.3-RC.2","v2.12.3-RC.1","v2.12.2-RC.4","v2.12.2-RC.3","v2.12.1","v2.12.2-RC.2","v2.12.2-RC.1","v2.12.0","v2.12.1-RC.5","v2.12.1-RC.4","v2.12.1-RC.3","v2.12.1-RC.2","v2.12.1-RC.1","v2.12.0-RC.6","v2.12.0-RC.5","v2.12.0-RC.4","v2.12.0-RC.3","v2.12.0-RC.2","v2.12.0-RC.1","v2.12.0-preview.2","v2.12.0-preview.1","v2.11.3","v2.11.3-RC.2","v2.11.3-RC.1","v2.11.2","v2.11.2-RC.3","v2.11.2-RC.2","v2.11.2-RC.1","v2.11.0","v2.11.0-RC.5","v2.11.0-RC.4","v2.11.0-RC.3","v2.11.0-RC.2","v2.11.0-RC.1","v2.10.3","v2.10.2","v2.10.1","v2.10.0","v2.9.22","v2.9.21","v2.9.20","v2.9.19","v2.9.18","v2.9.17","v2.9.16","v2.9.15","v2.9.14","v2.9.12","v2.9.11","v2.9.10","v2.9.9","v2.9.8","v2.9.7","v2.9.6","v2.9.5","v2.9.4","v2.9.3","v2.9.2","v2.9.1","v2.9.0","v2.8.4","v2.8.3","v2.8.2","v2.8.1","v2.8.0","v2.7.4","v2.7.3","v2.7.2","v2.7.1","v2.7.0","v2.7.0-rc2","v2.7.0-rc1","v2.6.6","v2.6.5","v2.6.4","v2.6.3","v2.6.2","v2.6.1","v2.6.0","v2.5.0","v2.4.0","v2.3.4","v2.3.3","v2.3.2","v2.3.1","v2.3.0","v2.2.6","v2.2.5","v2.2.4","v2.2.3","v2.2.2","v2.2.1","v2.2.0","v2.1.7","v2.1.6","v2.1.4","v2.1.2","v2.1.0","v2.0.4","v2.0.2","v2.0.0","v2.0.0-RC19","v2.0.0-RC14","v1.3.0","v1.2.0","v1.1.0","v1.0.6","v1.0.4","v1.0.2","v1.0.0","v0.9.6","v0.9.4","v0.9.2","v0.8.1","v0.8.0","v0.7.2","v0.7.0","v0.6.8","v0.6.6","v0.6.4","v0.6.2","v0.6.0","v0.5.6","v0.5.4","v0.5.2","v0.5.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58214.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"}]}