{"schema_version":"1.9.0","id":"BIT-nats-2026-29785","published":"2026-03-27T17:45:10.061Z","modified":"2026-09-08T08:47:47.472522693Z","aliases":["CVE-2026-29785","GHSA-52jh-2xxh-pwh6","GO-2026-4829"],"summary":"NATS Server panic via malicious compression on leafnode port","details":"NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.14 and 2.12.5, if the nats-server has the \"leafnode\" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication and requires that compression be enabled (which it is, by default, when leafnodes are used). Versions 2.11.14 and 2.12.5 contain a fix. As a workaround, disable compression on the leafnode port.","affected":[{"package":{"name":"nats","ecosystem":"Bitnami","purl":"pkg:bitnami/nats"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.11.14"},{"introduced":"2.12.0"},{"fixed":"2.12.5"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/nats/BIT-nats-2026-29785.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"}]}],"references":[{"type":"ADVISORY","url":"https://advisories.nats.io/CVE/secnote-2026-04.txt"},{"type":"FIX","url":"https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8"},{"type":"ADVISORY","url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29785"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:21769"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22347"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:23345"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-29785"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451444"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29785.json"}],"database_specific":{"cpes":["cpe:2.3:a:nats:nats_server:*:*:*:*:*:go:*:*"],"severity":"High"}}