CVE Explorer

CVE-2026-58211

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 client could be registered as the configured no_auth_user through a parser path used when the first client operation was not CONNECT, bypassing user-level connection restrictions such as allowed_connection_types or proxy_required that normal authentication would apply. This issue is fixed in versions 2.14.3 and 2.12.12.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f110e6c9d6b180edb768acf6a59db338ae9953f9de2cb6ddbdb6adca3acb58a6

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"nats-server","vendor":"nats-io","versions":[{"status":"affected","version":"< 2.12.12"},{"status":"affected","version":">= 2.14.0-RC.1, < 2.14.3"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:951e8191802f3e48433c734e8247cdda3d350eca0614290d2bacdfea99fe0cd8 · sha256:e63f40e1a7c03bae… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:951e8191802f3e48433c734e8247cdda3d350eca0614290d2bacdfea99fe0cd8 · sha256:e63f40e1a7c03bae… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:951e8191802f3e48433c734e8247cdda3d350eca0614290d2bacdfea99fe0cd8 · sha256:e63f40e1a7c03bae… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"name":"https://github.com/nats-io/nats-server/security/advisories/GHSA-hmmp-q8cx-v964","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-hmmp-q8cx-v964"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:951e8191802f3e48433c734e8247cdda3d350eca0614290d2bacdfea99fe0cd8 · sha256:e63f40e1a7c03bae… · /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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