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CVE-2026-33246

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a `Nats-Request-Info:` message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker. A leafnode connecting to a nats-server is not fully trusted unless the system a
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:383aa245d35814f03ca168a28f2d8ba84c6a13f25466f4370fc43ca45766cd2d
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-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:af3d81e5c7b8162dd49b0a189e2bdfc0485aa12f6558dff066a8d0b03c86b60d · sha256:33d5887c4261d6a9… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-290","description":"CWE-290: Authentication Bypass by Spoofing","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:af3d81e5c7b8162dd49b0a189e2bdfc0485aa12f6558dff066a8d0b03c86b60d · sha256:33d5887c4261d6a9… · /containers/cna/problemTypes/1/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:af3d81e5c7b8162dd49b0a189e2bdfc0485aa12f6558dff066a8d0b03c86b60d · sha256:33d5887c4261d6a9… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:af3d81e5c7b8162dd49b0a189e2bdfc0485aa12f6558dff066a8d0b03c86b60d · sha256:33d5887c4261d6a9… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:af3d81e5c7b8162dd49b0a189e2bdfc0485aa12f6558dff066a8d0b03c86b60d · sha256:33d5887c4261d6a9… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-290","description":"CWE-290: Authentication Bypass by Spoofing","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:af3d81e5c7b8162dd49b0a189e2bdfc0485aa12f6558dff066a8d0b03c86b60d · sha256:33d5887c4261d6a9… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"name":"https://advisories.nats.io/CVE/secnote-2026-08.txt","tags":["x_refsource_MISC"],"url":"https://advisories.nats.io/CVE/secnote-2026-08.txt"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:af3d81e5c7b8162dd49b0a189e2bdfc0485aa12f6558dff066a8d0b03c86b60d · sha256:33d5887c4261d6a9… · /containers/cna/references/1
{"name":"https://github.com/nats-io/nats-server/security/advisories/GHSA-55h8-8g96-x4hj","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-55h8-8g96-x4hj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:af3d81e5c7b8162dd49b0a189e2bdfc0485aa12f6558dff066a8d0b03c86b60d · sha256:33d5887c4261d6a9… · /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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