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CVE-2026-58213

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:899f9ac9cf5436d0c8024d00760331e39da9be6965765cb3dcd4876c0934a9bb
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":"< 2.12.9"},{"status":"affected","version":">= 2.14.0-RC.1, < 2.14.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3249d75f22e43df2f0cc159fe8fddba1301c4e6dbc3e098582e40c27ae348e65 · sha256:8677b045afd4681f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3249d75f22e43df2f0cc159fe8fddba1301c4e6dbc3e098582e40c27ae348e65 · sha256:8677b045afd4681f… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-74","description":"CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3249d75f22e43df2f0cc159fe8fddba1301c4e6dbc3e098582e40c27ae348e65 · sha256:8677b045afd4681f… · /containers/cna/problemTypes/0/descriptions/0

Source references

8 source assertions
{"name":"https://github.com/nats-io/nats-server/commit/366837cfc65ab9ccb4f98193c65e8daf238582d8","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/commit/366837cfc65ab9ccb4f98193c65e8daf238582d8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3249d75f22e43df2f0cc159fe8fddba1301c4e6dbc3e098582e40c27ae348e65 · sha256:8677b045afd4681f… · /containers/cna/references/3
{"name":"https://github.com/nats-io/nats-server/commit/64ebae40051ee497c481e10f316238faf0de1736","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/commit/64ebae40051ee497c481e10f316238faf0de1736"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3249d75f22e43df2f0cc159fe8fddba1301c4e6dbc3e098582e40c27ae348e65 · sha256:8677b045afd4681f… · /containers/cna/references/4
{"name":"https://github.com/nats-io/nats-server/commit/f14856b9e57a36818f43851cb69b6e33670885c9","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/commit/f14856b9e57a36818f43851cb69b6e33670885c9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3249d75f22e43df2f0cc159fe8fddba1301c4e6dbc3e098582e40c27ae348e65 · sha256:8677b045afd4681f… · /containers/cna/references/5
{"name":"https://github.com/nats-io/nats-server/pull/8163","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/pull/8163"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3249d75f22e43df2f0cc159fe8fddba1301c4e6dbc3e098582e40c27ae348e65 · sha256:8677b045afd4681f… · /containers/cna/references/1
{"name":"https://github.com/nats-io/nats-server/pull/8164","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/pull/8164"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3249d75f22e43df2f0cc159fe8fddba1301c4e6dbc3e098582e40c27ae348e65 · sha256:8677b045afd4681f… · /containers/cna/references/2
{"name":"https://github.com/nats-io/nats-server/releases/tag/v2.12.9","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3249d75f22e43df2f0cc159fe8fddba1301c4e6dbc3e098582e40c27ae348e65 · sha256:8677b045afd4681f… · /containers/cna/references/6
{"name":"https://github.com/nats-io/nats-server/releases/tag/v2.14.1","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/releases/tag/v2.14.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3249d75f22e43df2f0cc159fe8fddba1301c4e6dbc3e098582e40c27ae348e65 · sha256:8677b045afd4681f… · /containers/cna/references/7
{"name":"https://github.com/nats-io/nats-server/security/advisories/GHSA-qrcv-3558-gj4f","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-qrcv-3558-gj4f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3249d75f22e43df2f0cc159fe8fddba1301c4e6dbc3e098582e40c27ae348e65 · sha256:8677b045afd4681f… · /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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