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CVE-2026-58253

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, when no_auth_user was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an unauthenticated peer to bypass inter-server CONNECT authentication and operate with the privileges associated with that connection type. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:5a3397362a484be0a929b2242ec739990c628d90a2ab1cf959e8367b4e714d53
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":"< 2.11.16"},{"status":"affected","version":">= 2.12.0-preview.1, < 2.12.6"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7b084e8b8ae81bbeffbe9752be33f2cecb10294a7c260eab37565731c38f5f04 · sha256:1190bd61b31fefcd… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"LOW","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7b084e8b8ae81bbeffbe9752be33f2cecb10294a7c260eab37565731c38f5f04 · sha256:1190bd61b31fefcd… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7b084e8b8ae81bbeffbe9752be33f2cecb10294a7c260eab37565731c38f5f04 · sha256:1190bd61b31fefcd… · /containers/cna/problemTypes/0/descriptions/0

Source references

7 source assertions
{"name":"https://github.com/nats-io/nats-server/commit/7b81dd455ea95960090a84858c7662827948d1b6","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/commit/7b81dd455ea95960090a84858c7662827948d1b6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7b084e8b8ae81bbeffbe9752be33f2cecb10294a7c260eab37565731c38f5f04 · sha256:1190bd61b31fefcd… · /containers/cna/references/1
{"name":"https://github.com/nats-io/nats-server/commit/8b8e1ad4ceed32321e00d4fc6e76be05bc13bca6","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/commit/8b8e1ad4ceed32321e00d4fc6e76be05bc13bca6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7b084e8b8ae81bbeffbe9752be33f2cecb10294a7c260eab37565731c38f5f04 · sha256:1190bd61b31fefcd… · /containers/cna/references/2
{"name":"https://github.com/nats-io/nats-server/commit/b86147e81710a52b72a7f7275f91d69f723f5cb3","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/commit/b86147e81710a52b72a7f7275f91d69f723f5cb3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7b084e8b8ae81bbeffbe9752be33f2cecb10294a7c260eab37565731c38f5f04 · sha256:1190bd61b31fefcd… · /containers/cna/references/3
{"name":"https://github.com/nats-io/nats-server/releases/tag/v2.11.16","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/releases/tag/v2.11.16"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7b084e8b8ae81bbeffbe9752be33f2cecb10294a7c260eab37565731c38f5f04 · sha256:1190bd61b31fefcd… · /containers/cna/references/4
{"name":"https://github.com/nats-io/nats-server/releases/tag/v2.12.7","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7b084e8b8ae81bbeffbe9752be33f2cecb10294a7c260eab37565731c38f5f04 · sha256:1190bd61b31fefcd… · /containers/cna/references/5
{"name":"https://github.com/nats-io/nats-server/releases/tag/v2.14.0","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/releases/tag/v2.14.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7b084e8b8ae81bbeffbe9752be33f2cecb10294a7c260eab37565731c38f5f04 · sha256:1190bd61b31fefcd… · /containers/cna/references/6
{"name":"https://github.com/nats-io/nats-server/security/advisories/GHSA-38x3-76xf-cq45","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-38x3-76xf-cq45"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7b084e8b8ae81bbeffbe9752be33f2cecb10294a7c260eab37565731c38f5f04 · sha256:1190bd61b31fefcd… · /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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