HOMEVULNERABILITIESCVE-2026-33218
HIGH

CVE-2026-33218

CWE-20Published: March 25, 2026· Updated: Mar 26, 2026

7.5
CVSS v3.1
EPSS:0.11%probability of exploitation in 30 daysPercentile:30.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-33218 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

linuxfoundation1 product
nats-server
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://advisories.nats.io/CVE/secnote-2026-10.txt
ADVISORYhttps://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339

All References (2)

→
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

Quick Facts

CVE IDCVE-2026-33218
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-20
CISA KEVNo
EPSS (30d)0.11%
Affected1 vendor
PublishedMar 25, 2026

Related CVEs (CWE-20)

CVE-2026-47928
10.0
CVE-2026-34910
KEV10.0
CVE-2026-33587
10.0
CVE-2026-12537
10.0
CVE-2026-48055
10.0
CVE-2026-0848
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-33218 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2026-33218·NVD