{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-58253","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-29T21:54:30.330Z","datePublished":"2026-07-08T19:43:13.776Z","dateUpdated":"2026-07-09T13:35:24.068Z"},"containers":{"cna":{"title":"NATS Server: Route API Auth Bypass","problemTypes":[{"descriptions":[{"cweId":"CWE-287","lang":"en","description":"CWE-287: Improper Authentication","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"LOW","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L","version":"3.1"}}],"references":[{"name":"https://github.com/nats-io/nats-server/security/advisories/GHSA-38x3-76xf-cq45","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-38x3-76xf-cq45"},{"name":"https://github.com/nats-io/nats-server/commit/7b81dd455ea95960090a84858c7662827948d1b6","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/commit/7b81dd455ea95960090a84858c7662827948d1b6"},{"name":"https://github.com/nats-io/nats-server/commit/8b8e1ad4ceed32321e00d4fc6e76be05bc13bca6","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/commit/8b8e1ad4ceed32321e00d4fc6e76be05bc13bca6"},{"name":"https://github.com/nats-io/nats-server/commit/b86147e81710a52b72a7f7275f91d69f723f5cb3","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/commit/b86147e81710a52b72a7f7275f91d69f723f5cb3"},{"name":"https://github.com/nats-io/nats-server/releases/tag/v2.11.16","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/releases/tag/v2.11.16"},{"name":"https://github.com/nats-io/nats-server/releases/tag/v2.12.7","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.7"},{"name":"https://github.com/nats-io/nats-server/releases/tag/v2.14.0","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/releases/tag/v2.14.0"}],"affected":[{"vendor":"nats-io","product":"nats-server","versions":[{"version":"< 2.11.16","status":"affected"},{"version":">= 2.12.0-preview.1, < 2.12.6","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-07-08T19:43:13.776Z"},"descriptions":[{"lang":"en","value":"NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, when no_auth_user was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an unauthenticated peer to bypass inter-server CONNECT authentication and operate with the privileges associated with that connection type. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16."}],"source":{"advisory":"GHSA-38x3-76xf-cq45","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-09T13:35:15.515260Z","id":"CVE-2026-58253","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-09T13:35:24.068Z"}}]}}