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NVD Vulnerability Details :
CVE-2026-33246
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-25 Mar, 2026 | 20:16
Updated At-26 Mar, 2026 | 17:16

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.16.4MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Primary3.15.4MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Type: Secondary
Version: 3.1
Base score: 6.4
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Type: Primary
Version: 3.1
Base score: 5.4
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CPE Matches
The Linux Foundation
linuxfoundation
>>nats-server>>Versions before 2.11.15(exclusive)
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*
The Linux Foundation
linuxfoundation
>>nats-server>>Versions from 2.12.0(inclusive) to 2.12.6(exclusive)
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-287Primarysecurity-advisories@github.com
CWE-290Primarysecurity-advisories@github.com
CWE ID: CWE-287
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-290
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://advisories.nats.io/CVE/secnote-2026-08.txtsecurity-advisories@github.com
Vendor Advisory
https://github.com/nats-io/nats-server/security/advisories/GHSA-55h8-8g96-x4hjsecurity-advisories@github.com
Vendor Advisory
Hyperlink: https://advisories.nats.io/CVE/secnote-2026-08.txt
Source: security-advisories@github.com
Resource:
Vendor Advisory
Hyperlink: https://github.com/nats-io/nats-server/security/advisories/GHSA-55h8-8g96-x4hj
Source: security-advisories@github.com
Resource:
Vendor Advisory
Change History
0Changes found
Details not found