HOMEVULNERABILITIESCVE-2026-33223
MEDIUM

CVE-2026-33223

CWE-290Published: March 25, 2026· Updated: Mar 26, 2026

5.4
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:6.2th

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, the NATS message header `Nats-Request-Info:` is supposed to be a guarantee of identity by the NATS server, but the stripping of this header from inbound messages was not fully effective. An attacker with valid credentials for any regular client interface could thus spoof their identity to services which rely upon this header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

NVD Source

Technical Analysis

CVE-2026-33223 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

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-2026-09.txt
ADVISORYhttps://github.com/nats-io/nats-server/security/advisories/GHSA-pwx7-fx9r-hr4h

All References (2)

→
https://advisories.nats.io/CVE/secnote-2026-09.txtVendor Advisory
→
https://github.com/nats-io/nats-server/security/advisories/GHSA-pwx7-fx9r-hr4hVendor Advisory

Quick Facts

CVE IDCVE-2026-33223
CVSS Score5.4 / 10
SeverityMEDIUM
WeaknessCWE-290
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedMar 25, 2026

Related CVEs (CWE-290)

CVE-2026-39858
10.0
CVE-2026-6213
10.0
CVE-2026-25660
9.8
CVE-2026-48567
9.8
CVE-2021-47923
9.8
CVE-2026-44649
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-33223 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.
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