CVE-2026-33219
mediumPriorität · verfolgen · 0EPSS 0.005 · 46. PerzentilDEEUUSEPSS · bewertet 2026-10-27
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.
cvss
Technischer Schweregrad, 0–10. Eine Zeile je Quelle.
Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen⚠ Quellen uneinig · medium–high · 5.3–7.5
SSVC
Eine Handlungsentscheidung — aus Ausnutzung und Auswirkung.
schwächen
Die CWE-Schwächeklassen, zu denen dies gehört.
betroffene Produkte (14)
Betroffene Produkte und Versionsbereiche.
- linuxfoundation nats-server2.12.0 → 2.12.6nvdUScpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*
- Go github.com/nats-io/nats-server/v22.12.0-RC.1 → 2.12.6osvUSpkg:golang/github.com/nats-io/nats-server/v2
Advisories (4)
Hersteller- und Ökosystem-Meldungen dazu.
- WID-SEC-W-2026-0858NATS Server: Mehrere SchwachstellenDeutsch2026-03-24csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in NATS Server ausnutzen, um Informationen offenzulegen oder zu manipulieren, einen Denial-of-Service zu verursachen und Sicherheitsmechanismen zu umgehen.
- GHSA-8r68-gvr4-jh7jNATS is vulnerable to pre-auth DoS through WebSockets client service2026-03-24ghsa · osvUS
### Background NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing. The nats-server offers a WebSockets client service, used in deployments where browsers are the NATS clients. ### Problem Description 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 [NATS-advisory-ID 2026-02](https://advisories.nats.io/CVE/secnote-2026-02.txt) (aka CVE-2026-27571; GHSA-qrvq-68c2-7grw). That earlier issue was a compression bomb, this vulnerability is not. Attacks against this new issue thus require significant client bandwidth. ### Affected Versions Any version before v2.12.6 or v2.11.15 ### Workarounds Disable websockets if not required for project deployment.
- BIT-nats-2026-33219NATS is vulnerable to pre-auth DoS through WebSockets client service2026-03-27vendor · osvUS
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.
- GO-2026-4831NATS is vulnerable to pre-auth DoS through WebSockets client service in github.com/nats-io/nats-server2026-03-26vendor · osvUS
NATS is vulnerable to pre-auth DoS through WebSockets client service in github.com/nats-io/nats-server
auch bekannt als (6)
Weitere Namen und Kennungen dieser Entität.
- CNNVD-202603-4674cnnvd
- EUVD-2026-15970enisa_euvd
- GHSA-8r68-gvr4-jh7jenisa_euvd
- BIT-nats-2026-33219osv
- GHSA-8r68-gvr4-jh7josv
- GO-2026-4831osv
quellen
Welche Quellen diesen Datensatz belegen und wann.
Referenzen (20)
Externe Belege — Patches, Meldungen, Analysen.
- https://access.redhat.com/security/cve/cve-2026-33219cnnvd
- https://advisories.nats.io/CVE/secnote-2026-02.txtcnnvd
- https://advisories.nats.io/CVE/secnote-2026-11.txtcnnvd
- https://github.com/advisories/GHSA-qrvq-68c2-7grwcnnvd
- https://github.com/nats-io/nats-server/releases/tag/v2.12.6Patchcnnvd
- https://github.com/nats-io/nats-server/security/advisories/GHSA-8r68-gvr4-jh7jcnnvd
- https://advisories.nats.io/CVE/secnote-2026-02.txtenisa_euvd
- https://advisories.nats.io/CVE/secnote-2026-11.txtenisa_euvd
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