CVE-2026-33218
Last modified
CVE-2026-33218 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication. EPSS estimates a 0.62% chance of exploitation in the next 30 days.
Description
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable leafnode support if not needed or restrict network connections to the leafnode port, if plausible without compromising the service offered.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linuxfoundation | Nats-Server | < 2.11.15 |
| Linuxfoundation | Nats-Server | >= 2.12.0, < 2.12.6 |
References
- https://advisories.nats.io/CVE/secnote-2026-10.txtMitigation, Vendor Advisory
- https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-33218?
How severe is CVE-2026-33218?
How do I fix CVE-2026-33218?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-33212Weblate is a web based localization tool. In versions prior …3.1
- CVE-2026-33213Redash is a package for data visualization and sharing. From…6.1
- CVE-2026-33214Weblate is a web based localization tool. In versions prior …4.3
- CVE-2026-33215NATS-Server is a High-Performance server for NATS.io, a clou…6.5
- CVE-2026-33216NATS-Server is a High-Performance server for NATS.io, a clou…7.5
- CVE-2026-33217NATS-Server is a High-Performance server for NATS.io, a clou…6.5
- CVE-2026-33219NATS-Server is a High-Performance server for NATS.io, a clou…5.3
- CVE-2026-33220Weblate is a web based localization tool. In versions prior …6.8
- CVE-2026-33221Nhost is an open source Firebase alternative with GraphQL. P…5.3
- CVE-2026-33222NATS-Server is a High-Performance server for NATS.io, a clou…4.9
- CVE-2026-33223NATS-Server is a High-Performance server for NATS.io, a clou…5.4
- CVE-2026-33226Budibase is a low code platform for creating internal tools,…8.7
Are you affected by CVE-2026-33218?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST