{"id":"GO-2026-4830","revision":null,"records":[{"revision":"06c67df1d6444b7db003f7064cd80b75","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-33246","aliases":[],"title":"NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers","description":"NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a `Nats-Request-Info:` message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker. A leafnode connecting to a nats-server is not fully trusted unless the system account is bridged too. Thus identity claims should not have propagated unchecked. Prior to versions 2.11.15 and 2.12.6, NATS clients relying upon the Nats-Request-Info: header could be spoofed. This does not directly affect the nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical client might choose to do with this NATS header. Versions 2.11.15 and 2.12.6 contain a fix. 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The nats-server offers a `Nats-Request-Info:` message header, providing information about a request. This is supposed to provide enough informat…","description":"NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a `Nats-Request-Info:` message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker. A leafnode connecting to a nats-server is not fully trusted unless the system account is bridged too. Thus identity claims should not have propagated unchecked. Prior to versions 2.11.15 and 2.12.6, NATS clients relying upon the Nats-Request-Info: header could be spoofed. This does not directly affect the nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical client might choose to do with this NATS header. Versions 2.11.15 and 2.12.6 contain a fix. 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This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker. A leafnode connecting to a nats-server is not fully trusted unless the system account is bridged too. Thus identity claims should not have propagated unchecked. Prior to versions 2.11.15 and 2.12.6, NATS clients relying upon the Nats-Request-Info: header could be spoofed. This does not directly affect the nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical client might choose to do with this NATS header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.","state":0,"publishedAt":"2026-03-25T20:16:33.01+00:00","modifiedAt":"2026-06-17T10:37:11.157+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","score":6.4,"severity":"MEDIUM"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","score":5.4,"severity":"MEDIUM"}],"references":["https://advisories.nats.io/CVE/secnote-2026-08.txt","https://github.com/nats-io/nats-server/security/advisories/GHSA-55h8-8g96-x4hj"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-33246","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-287","CWE-290"],"productCriteria":["cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-03-25T20:16:33.010","lastModified":"2026-06-17T10:37:11.157"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-33246","identifiers":["CVE-2026-33246"]},"retained":false,"historicalAffected":[]},{"revision":"f8a21aa6ce7341a186424170119f2764","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-55h8-8g96-x4hj","aliases":["BIT-nats-2026-33246","CVE-2026-33246","GO-2026-4830"],"title":"NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers","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 allows hub/spoke topologies using \"leafnode\" connections by other nats-servers.  NATS messages can have headers.\n\n### Problem Description\n\nThe nats-server offers a `Nats-Request-Info:` message header, providing information about a request.  This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker.\n\nA leafnode connecting to a nats-server is not fully trusted unless the system account is bridged too.  Thus identity claims should not have propagated unchecked.\n\nThus NATS clients relying upon the Nats-Request-Info: header could be spoofed.\n\nDoes not directly affect the nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical client might choose to do with this NATS header.\n\n### Affected Versions\n\nAny version before v2.12.6 or v2.11.15\n\n### Workarounds\n\nNone.","state":0,"publishedAt":"2026-03-24T21:50:25+00:00","modifiedAt":"2026-09-10T03:50:59.8297372+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-55h8-8g96-x4hj","https://nvd.nist.gov/vuln/detail/CVE-2026-33246","https://advisories.nats.io/CVE/secnote-2026-08.txt","https://github.com/nats-io/nats-server"],"sourceUrl":"https://github.com/advisories/GHSA-55h8-8g96-x4hj","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-55h8-8g96-x4hj","identifiers":["GHSA-55h8-8g96-x4hj","BIT-nats-2026-33246","CVE-2026-33246","GO-2026-4830"]},"retained":false,"historicalAffected":[]},{"revision":"f6f13f7ca27447b982456f61592b3d5f","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-4830","aliases":["BIT-nats-2026-33246","CVE-2026-33246","GHSA-55h8-8g96-x4hj"],"title":"NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers in github.com/nats-io/nats-server","description":"NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers in github.com/nats-io/nats-server","state":0,"publishedAt":"2026-03-26T20:33:05+00:00","modifiedAt":"2026-03-27T18:26:07.658196+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-55h8-8g96-x4hj","https://advisories.nats.io/CVE/secnote-2026-08.txt"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-4830","license":"OSV · upstream source license applies","key":"osv:GO-2026-4830","identifiers":["GO-2026-4830","BIT-nats-2026-33246","CVE-2026-33246","GHSA-55h8-8g96-x4hj"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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