{"cve":"CVE-2026-33215","nvd":{"published":"2026-03-24T21:16:28.640","modified":"2026-06-17T10:37:08.227","status":"Analyzed","description":"NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server provides an MQTT client interface. Prior to versions 2.11.15 and 2.12.5, Sessions and Messages can by hijacked via MQTT Client ID malfeasance. Versions 2.11.15 and 2.12.5 patch the issue. No known workarounds are available.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","score":6.5},"cwes":["CWE-287","CWE-488"],"references":["https://advisories.nats.io/CVE/secnote-2026-06.tx","https://github.com/nats-io/nats-server/security/advisories/GHSA-fcjp-h8cc-6879"],"products":["linuxfoundation:nats-server"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-33215","score":0.00244,"percentile":0.15682,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-fcjp-h8cc-6879","url":"https://osv.dev/vulnerability/GHSA-fcjp-h8cc-6879","summary":"NATS is vulnerable to MQTT hijacking via Client ID","modified":"2026-09-10T03:51:00.306717387Z","packages":[{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","purl":"pkg:golang/github.com/nats-io/nats-server/v2","ranges":["<2.11.15"],"fixed":["2.11.15"]},{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","purl":"pkg:golang/github.com/nats-io/nats-server/v2","ranges":[">=2.12.0-RC.1 <2.12.6"],"fixed":["2.12.6"]}]},{"id":"GO-2026-4833","url":"https://osv.dev/vulnerability/GO-2026-4833","summary":"NATS is vulnerable to MQTT hijacking via Client ID in github.com/nats-io/nats-server","modified":"2026-03-27T17:29:30.301970Z","packages":[{"ecosystem":"Go","name":"github.com/nats-io/nats-server","purl":"pkg:golang/github.com/nats-io/nats-server","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","purl":"pkg:golang/github.com/nats-io/nats-server/v2","ranges":["<2.11.15",">=2.12.0-RC.1 <2.12.6"],"fixed":["2.11.15","2.12.6"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}