HOMEVULNERABILITIESCVE-2026-33246
MEDIUM

CVE-2026-33246

CWE-287Published: 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. The nats-server offers a `Nats-Request-Info:` message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker. A leafnode connecting to a nats-server is not fully trusted unless the system account is bridged too. Thus identity claims should not have propagated unchecked. Prior to versions 2.11.15 and 2.12.6, NATS clients relying upon the Nats-Request-Info: header could be spoofed. This does not directly affect the nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical client might choose to do with this NATS header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

NVD Source

Technical Analysis

CVE-2026-33246 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.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.

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-2026-08.txt
ADVISORYhttps://github.com/nats-io/nats-server/security/advisories/GHSA-55h8-8g96-x4hj

All References (2)

→
https://advisories.nats.io/CVE/secnote-2026-08.txtVendor Advisory
→
https://github.com/nats-io/nats-server/security/advisories/GHSA-55h8-8g96-x4hjVendor Advisory

Quick Facts

CVE IDCVE-2026-33246
CVSS Score5.4 / 10
SeverityMEDIUM
WeaknessCWE-287
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedMar 25, 2026

Related CVEs (CWE-287)

CVE-2026-42822
10.0
CVE-2026-23600
10.0
CVE-2026-41679
10.0
CVE-2026-30836
10.0
CVE-2026-20182
KEV10.0
CVE-2026-46389
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-33246 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-2026-33246·NVD