CVE-2026-33218

7.5 HIGH
Published: March 25, 2026 Modified: March 26, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://advisories.nats.io/CVE/secnote-2026-10.txt
Source: security-advisories@github.com
Mitigation Vendor Advisory
https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339
Source: security-advisories@github.com
Mitigation Vendor Advisory

2 reference(s) from NVD

Quick Stats

CVSS v3 Score
7.5 / 10.0
EPSS (Exploit Probability)
0.2%
38th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

linuxfoundation