{"schema_version":"1.7.5","id":"GHSA-pwx7-fx9r-hr4h","published":"2026-03-24T21:50:05Z","modified":"2026-03-27T22:17:38.378379Z","aliases":["BIT-nats-2026-33223","CVE-2026-33223","GO-2026-4835"],"related":["CGA-5pw7-h9g6-p4mx"],"summary":"NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing","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 offers a `Nats-Request-Info:` message header, providing information about a request.\n\n### Problem Description\n\nThe NATS message header `Nats-Request-Info:` is supposed to be a guarantee of identity by the NATS server, but the stripping of this header from inbound messages was not fully effective.\n\nAn attacker with valid credentials for any regular client interface could thus spoof their identity to services which rely upon this header.\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":"0"},{"fixed":"2.11.15"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-pwx7-fx9r-hr4h/GHSA-pwx7-fx9r-hr4h.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-RC.1"},{"fixed":"2.12.6"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-pwx7-fx9r-hr4h/GHSA-pwx7-fx9r-hr4h.json"}},{"package":{"name":"github.com/nats-io/nats-server","ecosystem":"Go","purl":"pkg:golang/github.com/nats-io/nats-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-pwx7-fx9r-hr4h/GHSA-pwx7-fx9r-hr4h.json"}}],"references":[{"type":"WEB","url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-pwx7-fx9r-hr4h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33223"},{"type":"WEB","url":"https://advisories.nats.io/CVE/secnote-2026-09.txt"},{"type":"PACKAGE","url":"https://github.com/nats-io/nats-server"}],"database_specific":{"cwe_ids":["CWE-290"],"github_reviewed":true,"github_reviewed_at":"2026-03-24T21:50:05Z","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:C/C:L/I:L/A:N"}]}