{"schema_version":"1.7.5","id":"GHSA-8m2x-3m6q-6w8j","published":"2026-03-24T20:37:08Z","modified":"2026-03-30T12:26:02.943661Z","aliases":["BIT-nats-2026-33249","CVE-2026-33249","GO-2026-4826"],"related":["CGA-j4q2-4fxj-9r3h"],"summary":"NATS: Message tracing can be redirected to arbitrary subject","details":"### Background\n\nNATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.\n\nThe nats-server supports telemetry on messages, using the per-message NATS headers.\n\n### Problem Description\n\nA 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.\n\nThe payload is a valid trace message and not chosen by the attacker.\n\n### Affected Versions\n\nAny version before v2.12.6 or v2.11.15\n\n### Workarounds\n\nNone.","affected":[{"package":{"name":"github.com/nats-io/nats-server/v2","ecosystem":"Go","purl":"pkg:golang/github.com/nats-io/nats-server/v2"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.11.0"},{"fixed":"2.11.15"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-8m2x-3m6q-6w8j/GHSA-8m2x-3m6q-6w8j.json"}},{"package":{"name":"github.com/nats-io/nats-server/v2","ecosystem":"Go","purl":"pkg:golang/github.com/nats-io/nats-server/v2"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.12.0-preview.1"},{"fixed":"2.12.6"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-8m2x-3m6q-6w8j/GHSA-8m2x-3m6q-6w8j.json"}}],"references":[{"type":"WEB","url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8j"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33249"},{"type":"WEB","url":"https://advisories.nats.io/CVE/secnote-2026-15.txt"},{"type":"PACKAGE","url":"https://github.com/nats-io/nats-server"}],"database_specific":{"cwe_ids":["CWE-863"],"github_reviewed":true,"github_reviewed_at":"2026-03-24T20:37:08Z","nvd_published_at":"2026-03-25T21:16:47Z","severity":"MODERATE"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"}]}