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CVE-2026-33248

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using mTLS for client identity, with `verify_and_map` to derive a NATS identity from the client certificate's Subject DN, certain patterns of RDN would not be correctly enforced, allowing for authentication bypass. This does require a valid certificate from a CA already trusted for client certificates, and `DN` naming patterns which the NATS maintainers consi
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:e240464f77849bcc8031938ee0f26fe09af9c1b886df492d4f9c579d7977834e
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-295","description":"CWE-295: Improper Certificate Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8c6ff2cf7e821fd51624d98979ec3ee7fecd86fa8b5e80ea68007a12c6c8a457 · sha256:066a687829619004… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8c6ff2cf7e821fd51624d98979ec3ee7fecd86fa8b5e80ea68007a12c6c8a457 · sha256:066a687829619004… · /containers/cna/problemTypes/0/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:v2:8c6ff2cf7e821fd51624d98979ec3ee7fecd86fa8b5e80ea68007a12c6c8a457 · sha256:066a687829619004… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.2,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/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:v2:8c6ff2cf7e821fd51624d98979ec3ee7fecd86fa8b5e80ea68007a12c6c8a457 · sha256:066a687829619004… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-295","description":"CWE-295: Improper Certificate Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8c6ff2cf7e821fd51624d98979ec3ee7fecd86fa8b5e80ea68007a12c6c8a457 · sha256:066a687829619004… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8c6ff2cf7e821fd51624d98979ec3ee7fecd86fa8b5e80ea68007a12c6c8a457 · sha256:066a687829619004… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://advisories.nats.io/CVE/secnote-2026-13.txt","tags":["x_refsource_MISC"],"url":"https://advisories.nats.io/CVE/secnote-2026-13.txt"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8c6ff2cf7e821fd51624d98979ec3ee7fecd86fa8b5e80ea68007a12c6c8a457 · sha256:066a687829619004… · /containers/cna/references/1
{"name":"https://github.com/nats-io/nats-server/security/advisories/GHSA-3f24-pcvm-5jqc","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-3f24-pcvm-5jqc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8c6ff2cf7e821fd51624d98979ec3ee7fecd86fa8b5e80ea68007a12c6c8a457 · sha256:066a687829619004… · /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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