{"cve":"CVE-2026-33249","nvd":{"published":"2026-03-25T21:16:47.737","modified":"2026-06-17T10:37:11.480","status":"Analyzed","description":"NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, a valid client which uses message tracing headers can indicate that the trace messages can be sent to an arbitrary valid subject, including those to which the client does not have publish permission. The payload is a valid trace message and not chosen by the attacker. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","score":4.3},"cwes":["CWE-863"],"references":["https://advisories.nats.io/CVE/secnote-2026-15.txt","https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8j"],"products":["linuxfoundation:nats-server"],"source":"nvd","synced_at":"2026-10-19T22:28:18.033120106+00:00"},"epss":{"cve":"CVE-2026-33249","score":0.00237,"percentile":0.14786,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-8m2x-3m6q-6w8j","url":"https://osv.dev/vulnerability/GHSA-8m2x-3m6q-6w8j","summary":"NATS: Message tracing can be redirected to arbitrary subject","modified":"2026-09-10T03:50:38.243601860Z","packages":[{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","purl":"pkg:golang/github.com/nats-io/nats-server/v2","ranges":[">=2.11.0 <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-preview.1 <2.12.6"],"fixed":["2.12.6"]}]},{"id":"GO-2026-4826","url":"https://osv.dev/vulnerability/GO-2026-4826","summary":"NATS: Message tracing can be redirected to arbitrary subject in github.com/nats-io/nats-server","modified":"2026-03-30T12:26:02.943661Z","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":[">=2.11.0 <2.11.15",">=2.12.0-preview.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."]}