{"id":"JLSEC-2026-1122","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.","modified":"2026-08-03T19:15:03.768811576Z","published":"2026-08-03T19:08:57.739Z","upstream":["CVE-2026-29785"],"database_specific":{"sources":[{"published":"2026-03-25T20:16:30.373Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-29785","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29785","database_specific":{"status":"Modified"},"id":"CVE-2026-29785","imported":"2026-08-03T18:16:27.031Z","modified":"2026-08-03T13:17:38.960Z"}],"license":"CC-BY-4.0"},"references":[{"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://advisories.nats.io/CVE/secnote-2026-04.txt"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451444"},{"type":"WEB","url":"https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8"},{"type":"WEB","url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29785.json"}],"affected":[{"package":{"name":"nats_server_jll","ecosystem":"Julia","purl":"pkg:julia/nats_server_jll?uuid=8b1691f7-6002-537d-bdf7-c6203599dc08"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.14.3+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1122.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}