{"cve":"CVE-2026-29785","nvd":{"published":"2026-03-25T20:16:30.373","modified":"2026-09-09T13:19:11.863","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-476","CWE-409"],"references":["https://advisories.nats.io/CVE/secnote-2026-04.txt","https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8","https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6","https://access.redhat.com/errata/RHSA-2026:21769","https://access.redhat.com/errata/RHSA-2026:22347"],"products":["linuxfoundation:nats-server"],"source":"nvd","synced_at":"2026-10-19T22:28:18.033120106+00:00"},"epss":{"cve":"CVE-2026-29785","score":0.00684,"percentile":0.52575,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-52jh-2xxh-pwh6","url":"https://osv.dev/vulnerability/GHSA-52jh-2xxh-pwh6","summary":"NATS Server panic via malicious compression on leafnode port","modified":"2026-09-10T03:50:59.782887480Z","packages":[{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","purl":"pkg:golang/github.com/nats-io/nats-server/v2","ranges":["<2.11.14"],"fixed":["2.11.14"]},{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","purl":"pkg:golang/github.com/nats-io/nats-server/v2","ranges":[">=2.12.0-RC.1 <2.12.5"],"fixed":["2.12.5"]},{"ecosystem":"Go","name":"github.com/nats-io/nats-server","purl":"pkg:golang/github.com/nats-io/nats-server","ranges":["all versions"],"fixed":[]}]},{"id":"GO-2026-4829","url":"https://osv.dev/vulnerability/GO-2026-4829","summary":"NATS Server panic via malicious compression on leafnode port in github.com/nats-io/nats-server","modified":"2026-03-31T05:29:17.729448Z","packages":[{"ecosystem":"Go","name":"github.com/nats-io/nats-server","purl":"pkg:golang/github.com/nats-io/nats-server","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","purl":"pkg:golang/github.com/nats-io/nats-server/v2","ranges":["<2.11.14",">=2.12.0-RC.1 <2.12.5"],"fixed":["2.11.14","2.12.5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}