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CVE-2026-58250

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.12.8 and 2.11.17, an unauthenticated peer with network access to a leafnode listener with compression enabled could crash the server during the pre-authentication leafnode handshake by sending repeated leafnode INFO protocol messages before authentication and account setup completed. This issue is fixed in versions 2.12.8 and 2.11.17.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8737a4e8408e77e281570d437d60f1c12702cafe72a68a1aa7b91815cdb75015
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":"< 2.11.17"},{"status":"affected","version":">= 2.12.0-preview.1, < 2.12.8"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e6061eda529cd681cea0fa8701286a70f0c5c7c86f42b56c3cbc359b6d25235c · sha256:374892a4aaa66923… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"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:e6061eda529cd681cea0fa8701286a70f0c5c7c86f42b56c3cbc359b6d25235c · sha256:374892a4aaa66923… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-476","description":"CWE-476: NULL Pointer Dereference","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e6061eda529cd681cea0fa8701286a70f0c5c7c86f42b56c3cbc359b6d25235c · sha256:374892a4aaa66923… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"name":"https://github.com/nats-io/nats-server/commit/8dcb26eaea78fdcbe96dbee5986d6019fd5cb94a","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/commit/8dcb26eaea78fdcbe96dbee5986d6019fd5cb94a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e6061eda529cd681cea0fa8701286a70f0c5c7c86f42b56c3cbc359b6d25235c · sha256:374892a4aaa66923… · /containers/cna/references/1
{"name":"https://github.com/nats-io/nats-server/commit/fc5fe39177533e9dbdd651d2458285bfae1dde27","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/commit/fc5fe39177533e9dbdd651d2458285bfae1dde27"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e6061eda529cd681cea0fa8701286a70f0c5c7c86f42b56c3cbc359b6d25235c · sha256:374892a4aaa66923… · /containers/cna/references/2
{"name":"https://github.com/nats-io/nats-server/releases/tag/v2.11.17","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/releases/tag/v2.11.17"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e6061eda529cd681cea0fa8701286a70f0c5c7c86f42b56c3cbc359b6d25235c · sha256:374892a4aaa66923… · /containers/cna/references/3
{"name":"https://github.com/nats-io/nats-server/releases/tag/v2.12.8","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e6061eda529cd681cea0fa8701286a70f0c5c7c86f42b56c3cbc359b6d25235c · sha256:374892a4aaa66923… · /containers/cna/references/4
{"name":"https://github.com/nats-io/nats-server/security/advisories/GHSA-3g5q-cfh2-cq67","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-3g5q-cfh2-cq67"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e6061eda529cd681cea0fa8701286a70f0c5c7c86f42b56c3cbc359b6d25235c · sha256:374892a4aaa66923… · /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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