CVE-2026-33249 Vulnerability Analysis & Exploit Details

CVE-2026-33249
Vulnerability Scoring

4.3

/10

Medium Risk

The vulnerability CVE-2026-33249 could compromise system integrity but typically requires user interaction to be exploited.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Network
Vulnerability is exploitable over a network without physical access.
Privileges Required: Low
Some privileges are necessary to exploit the vulnerability.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: None
No user interaction is necessary for exploitation.

CVE-2026-33249 Details

Status: Analyzed

Last updated: 🕓 26 Mar 2026, 16:20 UTC
Originally published on: 🕘 25 Mar 2026, 21:16 UTC

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVE-2026-33249 Vulnerability Summary

CVE-2026-33249: NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, a valid client which uses message tracing headers can indicate that the trace messages can be sent to an arbitrary valid subject, including those to which the client does not have publish permission. The payload is a valid trace message and not chosen by the attacker. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

Assessing the Risk of CVE-2026-33249

Access Complexity Graph

The exploitability of CVE-2026-33249 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-33249

CVE-2026-33249 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-33249, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-33249, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: None
CVE-2026-33249 has no significant impact on data confidentiality.
Integrity: Low
Exploiting CVE-2026-33249 may cause minor changes to data without severely impacting its accuracy.
Availability: None
CVE-2026-33249 does not impact system availability.

CVE-2026-33249 References

External References

CWE Common Weakness Enumeration

CWE-863

Vulnerable Configurations

cpe:2.3:a:linuxfoundation:nats-server:2.11.0:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:preview1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:preview1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:preview2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.0:preview2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.1:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.1:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.2:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.2:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.2:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.2:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.2:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.2:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.2:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.2:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.3:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.3:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.3:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.3:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.3:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.3:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.4:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.4:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.4:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.4:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.4:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.4:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.4:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.4:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.5:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.5:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.5:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.5:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.5:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.5:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.5:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.5:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.5:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.5:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.6:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.6:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.6:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.6:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.7:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.7:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.7:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.7:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.7:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.7:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.7:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.7:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.8:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.8:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.8:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.8:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.9:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.9:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.9:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.9:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.9:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.9:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.9:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.9:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.10:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.10:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.10:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.10:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.11:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.11:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.11:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.11:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.11:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.11:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.11:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.11:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.11:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.11:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:rc6:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:rc6:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:rc7:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.11.12:rc7:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc6:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc6:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:preview1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:preview1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:preview2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:preview2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc6:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc6:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.5:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.5:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.5:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.5:rc2:*:*:*:*:*:*

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