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CVE-2026-33249

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, a valid client which uses message tracing headers can indicate that the trace messages can be sent to an arbitrary valid subject, including those to which the client does not have publish permission. The payload is a valid trace message and not chosen by the attacker. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds ar
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:3b52c09daa55ff4d8fa0264844366db7fdaa07fe2f1d894218a7c82bb355acba
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":">= 2.11.0, < 2.11.15"},{"status":"affected","version":">= 2.12.0-preview.1, < 2.12.6"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f4187c0ff525be4398bfb5a2bcb4c9b271b5419f930d63a5a2884c8884332750 · sha256:addd2f4e0ae8f812… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f4187c0ff525be4398bfb5a2bcb4c9b271b5419f930d63a5a2884c8884332750 · sha256:addd2f4e0ae8f812… · /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:f4187c0ff525be4398bfb5a2bcb4c9b271b5419f930d63a5a2884c8884332750 · sha256:addd2f4e0ae8f812… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://advisories.nats.io/CVE/secnote-2026-15.txt","tags":["x_refsource_MISC"],"url":"https://advisories.nats.io/CVE/secnote-2026-15.txt"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f4187c0ff525be4398bfb5a2bcb4c9b271b5419f930d63a5a2884c8884332750 · sha256:addd2f4e0ae8f812… · /containers/cna/references/1
{"name":"https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8j","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8j"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f4187c0ff525be4398bfb5a2bcb4c9b271b5419f930d63a5a2884c8884332750 · sha256:addd2f4e0ae8f812… · /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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