CVE-2026-33218

· HIGHModified

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CVSS v3.1

7.5

EPSS

0.62%

Published

Mar 25, 2026

Modified

Aug 3, 2026

Public PoC / Exploit

All weaponized →

No public PoC or exploit code indexed for this CVE.

Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-20CWE-1286

Affected Products (2)

linuxfoundation · nats-server (up to 2.11.15)vulnerable

linuxfoundation · nats-server (up to 2.12.6)vulnerable

References (8)

https://advisories.nats.io/CVE/secnote-2026-10.txt

MitigationVendor Advisory

https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339

MitigationVendor Advisory