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CVE-2026-33219

A flaw was found in NATS-Server. A malicious client connecting to the WebSockets port can cause unbounded memory use before authentication by sending a large amount of data. This resource exhaustion vulnerability can lead to a Denial of Service (DoS) for the server, making it unavailable to legitimate users.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2954e761a1ca52ab4c7b199d1892b225d4318b1e9725380ee818004ae99a7247
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
3

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 5 assertions

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift:4"],"defaultStatus":"unaffected","packageName":"openshift4/oc-mirror-plugin-rhel9","product":"Red Hat OpenShift Container Platform 4","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/affected/3

{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:multicluster_globalhub:1.6::el9"],"defaultStatus":"affected","packageName":"multicluster-globalhub/multicluster-globalhub-grafana-rhel9","product":"Red Hat multicluster global hub 1.6.0","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1780167118","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/affected/2

{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:multicluster_globalhub:1.5::el9"],"defaultStatus":"affected","packageName":"multicluster-globalhub/multicluster-globalhub-grafana-rhel9","product":"Multicluster Global Hub 1.5.4","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1778867753","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/affected/0

{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:multicluster_globalhub:1.4::el9"],"defaultStatus":"affected","packageName":"multicluster-globalhub/multicluster-globalhub-grafana-rhel9","product":"Red Hat multicluster global hub 1.4.4","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1779579439","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/affected/1

{"product":"nats-server","vendor":"nats-io","versions":[{"status":"affected","version":"< 2.11.15"},{"status":"affected","version":">= 2.12.0-RC.1, < 2.12.6"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/cna/affected/0
cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/metrics/1/cvssV3_1

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/cna/metrics/0/cvssV3_1
cwe · 2 assertions

{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-770","description":"Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/problemTypes/0/descriptions/0

Affected products and versions

5 source assertions
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift:4"],"defaultStatus":"unaffected","packageName":"openshift4/oc-mirror-plugin-rhel9","product":"Red Hat OpenShift Container Platform 4","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/affected/3
{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:multicluster_globalhub:1.6::el9"],"defaultStatus":"affected","packageName":"multicluster-globalhub/multicluster-globalhub-grafana-rhel9","product":"Red Hat multicluster global hub 1.6.0","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1780167118","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/affected/2
{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:multicluster_globalhub:1.5::el9"],"defaultStatus":"affected","packageName":"multicluster-globalhub/multicluster-globalhub-grafana-rhel9","product":"Multicluster Global Hub 1.5.4","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1778867753","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/affected/0
{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:multicluster_globalhub:1.4::el9"],"defaultStatus":"affected","packageName":"multicluster-globalhub/multicluster-globalhub-grafana-rhel9","product":"Red Hat multicluster global hub 1.4.4","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1779579439","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/affected/1
{"product":"nats-server","vendor":"nats-io","versions":[{"status":"affected","version":"< 2.11.15"},{"status":"affected","version":">= 2.12.0-RC.1, < 2.12.6"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/metrics/1/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-770","description":"Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/problemTypes/0/descriptions/0

Source references

10 source assertions
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:21769"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/references/3
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:22347"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/references/4
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:23345"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/references/5
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-33219"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/references/0
{"name":"https://advisories.nats.io/CVE/secnote-2026-02.txt","tags":["x_refsource_MISC"],"url":"https://advisories.nats.io/CVE/secnote-2026-02.txt"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/cna/references/1
{"name":"https://advisories.nats.io/CVE/secnote-2026-11.txt","tags":["x_refsource_MISC"],"url":"https://advisories.nats.io/CVE/secnote-2026-11.txt"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/cna/references/2
{"name":"RHBZ#2451445","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451445"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/references/1
{"name":"https://github.com/advisories/GHSA-qrvq-68c2-7grw","tags":["x_refsource_MISC"],"url":"https://github.com/advisories/GHSA-qrvq-68c2-7grw"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/cna/references/3
{"name":"https://github.com/nats-io/nats-server/security/advisories/GHSA-8r68-gvr4-jh7j","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-8r68-gvr4-jh7j"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/cna/references/0
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33219.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c3a0ae0d2bfb3ca3d3bcc91b5374f7990f5710b3b2d4d55c88aa01edea0bfd2 · sha256:7fff4977f07f2764… · /containers/adp/1/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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