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CVE-2026-58208

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, a WebSocket listener could route requests for the MQTT-over-WebSocket path into MQTT handling even when MQTT was not configured, allowing an unauthenticated client with access to the WebSocket listener to reach uninitialized MQTT state and crash the server process. This issue is fixed in versions 2.14.3 and 2.12.12.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:662a411124afe22b858cff12821ba1ec9a5c8a9f4278832dfd1153b9d1c423df
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"nats-server","vendor":"nats-io","versions":[{"status":"affected","version":">= 2.14.0-RC.1, < 2.14.3"},{"status":"affected","version":"< 2.12.12"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7fce3b99e0d3cf3eacc9e3507d1788404da11bc7b13c7ccff514830509e866ed · sha256:7b7416dad883b7f0… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.8,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7fce3b99e0d3cf3eacc9e3507d1788404da11bc7b13c7ccff514830509e866ed · sha256:7b7416dad883b7f0… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-248","description":"CWE-248: Uncaught Exception","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7fce3b99e0d3cf3eacc9e3507d1788404da11bc7b13c7ccff514830509e866ed · sha256:7b7416dad883b7f0… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"name":"https://github.com/nats-io/nats-server/commit/73b3dd9a5ea0fa7bf08b702338676355b29b5fb4","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/commit/73b3dd9a5ea0fa7bf08b702338676355b29b5fb4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7fce3b99e0d3cf3eacc9e3507d1788404da11bc7b13c7ccff514830509e866ed · sha256:7b7416dad883b7f0… · /containers/cna/references/1
{"name":"https://github.com/nats-io/nats-server/commit/837536b98b3a9280b993282155ff2bdd3ca38c30","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/commit/837536b98b3a9280b993282155ff2bdd3ca38c30"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7fce3b99e0d3cf3eacc9e3507d1788404da11bc7b13c7ccff514830509e866ed · sha256:7b7416dad883b7f0… · /containers/cna/references/2
{"name":"https://github.com/nats-io/nats-server/releases/tag/v2.12.12","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.12"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7fce3b99e0d3cf3eacc9e3507d1788404da11bc7b13c7ccff514830509e866ed · sha256:7b7416dad883b7f0… · /containers/cna/references/3
{"name":"https://github.com/nats-io/nats-server/releases/tag/v2.14.3","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/releases/tag/v2.14.3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7fce3b99e0d3cf3eacc9e3507d1788404da11bc7b13c7ccff514830509e866ed · sha256:7b7416dad883b7f0… · /containers/cna/references/4
{"name":"https://github.com/nats-io/nats-server/security/advisories/GHSA-p957-7v2w-g93g","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-p957-7v2w-g93g"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7fce3b99e0d3cf3eacc9e3507d1788404da11bc7b13c7ccff514830509e866ed · sha256:7b7416dad883b7f0… · /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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