{"id":"GO-2026-4835","revision":null,"records":[{"revision":"74eb5fd9dfb34086ad286b4a37fa275c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-33223","aliases":[],"title":"NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing","description":"NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, the 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. An attacker with valid credentials for any regular client interface could thus spoof their identity to services which rely upon this header. Versions 2.11.15 and 2.12.6 contain a fix. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-33223","identifiers":["CVE-2026-33223"]},"retained":false,"historicalAffected":[]},{"revision":"79e1d98585e94f739c71e624dd44ed13","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-pwx7-fx9r-hr4h","aliases":["BIT-nats-2026-33223","CVE-2026-33223","GO-2026-4835"],"title":"NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing","description":"### 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.","state":0,"publishedAt":"2026-03-24T21:50:05+00:00","modifiedAt":"2026-09-10T03:50:40.3140584+00:00","affected":[{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.11.15"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.12.0-RC.1"},{"kind":"fixed","version":"2.12.6"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/nats-io/nats-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/nats-io/nats-server/security/advisories/GHSA-pwx7-fx9r-hr4h","https://nvd.nist.gov/vuln/detail/CVE-2026-33223","https://advisories.nats.io/CVE/secnote-2026-09.txt","https://github.com/nats-io/nats-server"],"sourceUrl":"https://github.com/advisories/GHSA-pwx7-fx9r-hr4h","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-pwx7-fx9r-hr4h","identifiers":["GHSA-pwx7-fx9r-hr4h","BIT-nats-2026-33223","CVE-2026-33223","GO-2026-4835"]},"retained":false,"historicalAffected":[]},{"revision":"1295dc40e0fa4aaba79ee027c969c9a8","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-4835","aliases":["BIT-nats-2026-33223","CVE-2026-33223","GHSA-pwx7-fx9r-hr4h"],"title":"NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing in github.com/nats-io/nats-server","description":"NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing in github.com/nats-io/nats-server","state":0,"publishedAt":"2026-03-26T20:33:05+00:00","modifiedAt":"2026-03-27T18:26:13.860415+00:00","affected":[{"ecosystem":"Go","name":"github.com/nats-io/nats-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.11.15"},{"kind":"introduced","version":"2.12.0-RC.1"},{"kind":"fixed","version":"2.12.6"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/nats-io/nats-server/security/advisories/GHSA-pwx7-fx9r-hr4h","https://advisories.nats.io/CVE/secnote-2026-09.txt"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-4835","license":"OSV · upstream source license applies","key":"osv:GO-2026-4835","identifiers":["GO-2026-4835","BIT-nats-2026-33223","CVE-2026-33223","GHSA-pwx7-fx9r-hr4h"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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