GHSA-vprv-35vv-q339
Suggest an improvement- Source
- https://github.com/advisories/GHSA-vprv-35vv-q339
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-vprv-35vv-q339/GHSA-vprv-35vv-q339.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-vprv-35vv-q339
- Aliases
-
- BIT-nats-2026-33218
- CVE-2026-33218
- GO-2026-4837
- Downstream
- Related
- Published
- 2026-03-24T21:45:29Z
- Modified
- 2026-03-27T22:18:40.857350Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- NATS has pre-auth server panic via leafnode handling
- Details
-
Background
NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.
The nats-server allows hub/spoke topologies using "leafnode" connections by other nats-servers.
Problem Description
A client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication.
Affected Versions
Any version before v2.12.6 or v2.11.15
Workarounds
- Disable leafnode support if not needed.
- Restrict network connections to your leafnode port, if plausible without compromising the service offered.
References
- This document is canonically: https://advisories.nats.io/CVE/secnote-2026-10.txt
- GHSA advisory: https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339
- MITRE CVE entry: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33218
- Database specific
{ "github_reviewed": true, "cwe_ids": [ "CWE-20" ], "nvd_published_at": "2026-03-25T20:16:32Z", "github_reviewed_at": "2026-03-24T21:45:29Z", "severity": "HIGH" }- References
Affected packages
Go / github.com/nats-io/nats-server/v2
Package
- Name
- github.com/nats-io/nats-server/v2
- View open source insights on deps.dev
- Purl
- pkg:golang/github.com/nats-io/nats-server/v2
Go / github.com/nats-io/nats-server/v2
Package
- Name
- github.com/nats-io/nats-server/v2
- View open source insights on deps.dev
- Purl
- pkg:golang/github.com/nats-io/nats-server/v2
Go / github.com/nats-io/nats-server
Package
- Name
- github.com/nats-io/nats-server
- View open source insights on deps.dev
- Purl
- pkg:golang/github.com/nats-io/nats-server