CVE-2026-33219 (GCVE-0-2026-33219)
Vulnerability from cvelistv5 – Published: 2026-03-25 19:55 – Updated: 2026-09-09 12:05
VLAI
EPSS
VEX
Title
NATS is vulnerable to pre-auth DoS through WebSockets client service
Summary
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, a malicious client which can connect to the WebSockets port can cause unbounded memory use in the nats-server before authentication; this requires sending a corresponding amount of data. This is a milder variant of CVE-2026-27571. That earlier issue was a compression bomb, this vulnerability is not. Attacks against this new issue thus require significant client bandwidth. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable websockets if not required for project deployment.
Severity
5.3 (Medium)
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-25 20:10 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://github.com/nats-io/nats-server/security/a… | x_refsource_CONFIRM |
| https://advisories.nats.io/CVE/secnote-2026-02.txt | x_refsource_MISC |
| https://advisories.nats.io/CVE/secnote-2026-11.txt | x_refsource_MISC |
| https://github.com/advisories/GHSA-qrvq-68c2-7grw | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-33219 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2451445 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:22347 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:23345 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:21769 | vendor-advisoryx_refsource_REDHAT |
Impacted products
5 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| nats-io | nats-server |
Affected:
< 2.11.15
Affected: >= 2.12.0-RC.1, < 2.12.6 |
guessed | |
| Red Hat | Multicluster Global Hub 1.4.5 |
Unaffected:
1779579439 , < *
(rpm)
cpe:/a:redhat:multicluster_globalhub:1.4::el9 |
||
| Red Hat | Multicluster Global Hub 1.6.5 |
Unaffected:
1780167118 , < *
(rpm)
cpe:/a:redhat:multicluster_globalhub:1.6::el9 |
||
| Red Hat | Red Hat multicluster global hub 1.5.3 |
Unaffected:
1778867753 , < *
(rpm)
cpe:/a:redhat:multicluster_globalhub:1.5::el9 |
||
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4
|
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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