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CVE-2026-33215

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server provides an MQTT client interface. Prior to versions 2.11.15 and 2.12.5, Sessions and Messages can by hijacked via MQTT Client ID malfeasance. Versions 2.11.15 and 2.12.5 patch the issue. No known workarounds are available.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:48a206d3b98a6f032af39bb06300375f55c979e246c3218faaaa7380f610af8e
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-488","description":"CWE-488: Exposure of Data Element to Wrong Session","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:653d18033a24aefe30fc0d2c0591bd46d2b885f40f19c56344fa225e022d9da0 · sha256:9147642c0a52fe16… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:653d18033a24aefe30fc0d2c0591bd46d2b885f40f19c56344fa225e022d9da0 · sha256:9147642c0a52fe16… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"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:v2:653d18033a24aefe30fc0d2c0591bd46d2b885f40f19c56344fa225e022d9da0 · sha256:9147642c0a52fe16… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:653d18033a24aefe30fc0d2c0591bd46d2b885f40f19c56344fa225e022d9da0 · sha256:9147642c0a52fe16… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-488","description":"CWE-488: Exposure of Data Element to Wrong Session","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:653d18033a24aefe30fc0d2c0591bd46d2b885f40f19c56344fa225e022d9da0 · sha256:9147642c0a52fe16… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:653d18033a24aefe30fc0d2c0591bd46d2b885f40f19c56344fa225e022d9da0 · sha256:9147642c0a52fe16… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://advisories.nats.io/CVE/secnote-2026-06.tx","tags":["x_refsource_MISC"],"url":"https://advisories.nats.io/CVE/secnote-2026-06.tx"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:653d18033a24aefe30fc0d2c0591bd46d2b885f40f19c56344fa225e022d9da0 · sha256:9147642c0a52fe16… · /containers/cna/references/1
{"name":"https://github.com/nats-io/nats-server/security/advisories/GHSA-fcjp-h8cc-6879","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-fcjp-h8cc-6879"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:653d18033a24aefe30fc0d2c0591bd46d2b885f40f19c56344fa225e022d9da0 · sha256:9147642c0a52fe16… · /containers/cna/references/0

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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