{"id":"CVE-2026-58250","summary":"NATS Server: Pre-auth server crash via double INFO in leafnode handshake","details":"NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.12.8 and 2.11.17, an unauthenticated peer with network access to a leafnode listener with compression enabled could crash the server during the pre-authentication leafnode handshake by sending repeated leafnode INFO protocol messages before authentication and account setup completed. This issue is fixed in versions 2.12.8 and 2.11.17.","aliases":["BIT-nats-2026-58250","GHSA-3g5q-cfh2-cq67"],"modified":"2026-08-12T03:51:16.332916966Z","published":"2026-07-08T19:48:55.058Z","database_specific":{"cwe_ids":["CWE-476"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58250.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/nats-io/nats-server/releases/tag/v2.11.17"},{"type":"WEB","url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58250.json"},{"type":"ADVISORY","url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-3g5q-cfh2-cq67"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58250"},{"type":"FIX","url":"https://github.com/nats-io/nats-server/commit/8dcb26eaea78fdcbe96dbee5986d6019fd5cb94a"},{"type":"FIX","url":"https://github.com/nats-io/nats-server/commit/fc5fe39177533e9dbdd651d2458285bfae1dde27"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nats-io/nats-server","events":[{"introduced":"0"},{"fixed":"0f192db71455eaca7f1fef14548a239845f24b96"},{"introduced":"fc6ec648d806652d282d2f0edb6cb9f22c895572"},{"fixed":"e9559e9ae3cd09ed29b157e6f19babb2cd1609e5"},{"fixed":"8dcb26eaea78fdcbe96dbee5986d6019fd5cb94a"},{"fixed":"fc5fe39177533e9dbdd651d2458285bfae1dde27"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"2.11.17"},{"introduced":"2.12.0"},{"fixed":"2.12.8"}]}}],"versions":["v2.12.7","v2.11.16","v2.11.15","v2.12.4","v2.12.6","v2.11.14","v2.12.5","v2.11.12","v2.12.5-RC.2","v2.12.5-RC.1","v2.11.12-RC.7","v2.12.4-RC.6","v2.11.12-RC.6","v2.12.4-RC.5","v2.11.12-RC.5","v2.12.4-RC.4","v2.12.2","v2.11.12-RC.4","v2.12.4-RC.3","v2.12.4-RC.2","v2.11.12-RC.3","v2.12.4-RC.1","v2.11.12-RC.2","v2.12.3","v2.11.12-RC.1","v2.11.11","v2.12.3-RC.5","v2.12.3-RC.4","v2.12.3-RC.3","v2.12.3-RC.2","v2.12.3-RC.1","v2.12.2-RC.4","v2.11.11-RC.4","v2.12.2-RC.3","v2.11.11-RC.3","v2.12.1","v2.12.2-RC.2","v2.11.11-RC.2","v2.11.11-RC.1","v2.12.2-RC.1","v2.11.10","v2.12.0","v2.12.1-RC.5","v2.12.1-RC.4","v2.12.1-RC.3","v2.12.1-RC.2","v2.12.1-RC.1","v2.11.10-RC.1","v2.11.9","v2.11.9-RC.3","v2.11.9-RC.2","v2.11.9-RC.1","v2.11.8","v2.11.8-RC.1","v2.11.7","v2.11.7-RC.3","v2.11.7-RC.2","v2.11.7-RC.1","v2.11.6","v2.11.6-RC.1","v2.11.5","v2.11.5-RC.4","v2.11.5-RC.3","v2.11.5-RC.2","v2.11.5-RC.1","v2.11.4","v2.11.4-RC.3","v2.11.4-RC.2","v2.11.4-RC.1","v2.11.3","v2.11.3-RC.2","v2.11.3-RC.1","v2.11.2","v2.11.2-RC.3","v2.11.2-RC.2","v2.11.2-RC.1","v2.11.0","v2.11.0-RC.5","v2.11.0-RC.4","v2.11.0-RC.3","v2.11.0-RC.2","v2.11.0-RC.1","v2.10.3","v2.10.2","v2.10.1","v2.10.0","v2.9.22","v2.9.21","v2.9.20","v2.9.19","v2.9.18","v2.9.17","v2.9.16","v2.9.15","v2.9.14","v2.9.12","v2.9.11","v2.9.10","v2.9.9","v2.9.8","v2.9.7","v2.9.6","v2.9.5","v2.9.4","v2.9.3","v2.9.2","v2.9.1","v2.9.0","v2.8.4","v2.8.3","v2.8.2","v2.8.1","v2.8.0","v2.7.4","v2.7.3","v2.7.2","v2.7.1","v2.7.0","v2.7.0-rc2","v2.7.0-rc1","v2.6.6","v2.6.5","v2.6.4","v2.6.3","v2.6.2","v2.6.1","v2.6.0","v2.5.0","v2.4.0","v2.3.4","v2.3.3","v2.3.2","v2.3.1","v2.3.0","v2.2.6","v2.2.5","v2.2.4","v2.2.3","v2.2.2","v2.2.1","v2.2.0","v2.1.7","v2.1.6","v2.1.4","v2.1.2","v2.1.0","v2.0.4","v2.0.2","v2.0.0","v2.0.0-RC19","v2.0.0-RC14","v1.3.0","v1.2.0","v1.1.0","v1.0.6","v1.0.4","v1.0.2","v1.0.0","v0.9.6","v0.9.4","v0.9.2","v0.8.1","v0.8.0","v0.7.2","v0.7.0","v0.6.8","v0.6.6","v0.6.4","v0.6.2","v0.6.0","v0.5.6","v0.5.4","v0.5.2","v0.5.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58250.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}