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CVE-2026-33249

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in…

CVSS 3.1 · [email protected] · Secondary 4.3 MEDIUMCheck source for fixed versionsKEV status unknown
Original advisory

Historical advisory recorded 25 Oct 2026 08:17:18 UTC. Read the latest advisory.

nvd · CVE-2026-33249

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

nvd · CVE-2026-33249

Published

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 tra…

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.

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-863

Original publisher date fields

published: 2026-03-25T21:16:47.737

lastModified: 2026-06-17T10:37:11.480

1 source CPE criteria · context only
  • cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published
25 Mar 2026 21:16:47 UTC
Source modified
17 Jun 2026 10:37:11 UTC
Saved here
25 Oct 2026 08:17:18 UTC
Source terms
NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · [email protected] · Secondary · 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

ChangeIntel

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Sources read 15 Nov 21:13 UTC · 254 of 275 readable · 250 fully read · documentation 469/469 current

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