{"id":"BIT-nats-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":["CVE-2026-58250","GHSA-3g5q-cfh2-cq67"],"modified":"2026-09-29T10:00:06.205456857Z","published":"2026-07-14T15:47:15.935Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:nats:nats_server:*:*:*:*:*:*:*:*","cpe:2.3:a:nats:nats_server:*:*:*:*:*:go:*:*"]},"references":[{"type":"FIX","url":"https://github.com/nats-io/nats-server/commit/8dcb26eaea78fdcbe96dbee5986d6019fd5cb94a"},{"type":"FIX","url":"https://github.com/nats-io/nats-server/commit/fc5fe39177533e9dbdd651d2458285bfae1dde27"},{"type":"ARTICLE","url":"https://github.com/nats-io/nats-server/releases/tag/v2.11.17"},{"type":"ARTICLE","url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.8"},{"type":"ADVISORY","url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-3g5q-cfh2-cq67"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58250"}],"affected":[{"package":{"name":"nats","ecosystem":"Bitnami","purl":"pkg:bitnami/nats"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.11.17"},{"introduced":"2.12.0"},{"fixed":"2.12.8"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/nats/BIT-nats-2026-58250.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}],"schema_version":"1.9.0"}