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CVE-2026-27571

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The WebSockets handling of NATS messages handles compressed messages via the WebSockets negotiated compression. Prior to versions 2.11.2 and 2.12.3, the implementation bound the memory size of a NATS message but did not independently bound the memory consumption of the memory stream when constructing a NATS message which might then fail validation for size reasons. An attacker can use a compression bo
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:63451a042e2825e60d5a5a1864fe403997a463df4d90a57bc2344d4b342cfcbf
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-409","description":"CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2ff45444c211824cb6b0ee71b99eaab65e324fd35cc3208ac9e0e633ed17cf3e · sha256:33066a3176584f1e… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2ff45444c211824cb6b0ee71b99eaab65e324fd35cc3208ac9e0e633ed17cf3e · sha256:33066a3176584f1e… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"nats-server","vendor":"nats-io","versions":[{"status":"affected","version":"< 2.11.12"},{"status":"affected","version":">= 2.12.0-RC.1, < 2.12.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2ff45444c211824cb6b0ee71b99eaab65e324fd35cc3208ac9e0e633ed17cf3e · sha256:33066a3176584f1e… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/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:v2:2ff45444c211824cb6b0ee71b99eaab65e324fd35cc3208ac9e0e633ed17cf3e · sha256:33066a3176584f1e… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-409","description":"CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2ff45444c211824cb6b0ee71b99eaab65e324fd35cc3208ac9e0e633ed17cf3e · sha256:33066a3176584f1e… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2ff45444c211824cb6b0ee71b99eaab65e324fd35cc3208ac9e0e633ed17cf3e · sha256:33066a3176584f1e… · /containers/cna/problemTypes/1/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/nats-io/nats-server/commit/f77fb7c4535e6727cc1a2899cd8e6bbdd8ba2017","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/commit/f77fb7c4535e6727cc1a2899cd8e6bbdd8ba2017"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2ff45444c211824cb6b0ee71b99eaab65e324fd35cc3208ac9e0e633ed17cf3e · sha256:33066a3176584f1e… · /containers/cna/references/1
{"name":"https://github.com/nats-io/nats-server/releases/tag/v2.11.12","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/releases/tag/v2.11.12"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2ff45444c211824cb6b0ee71b99eaab65e324fd35cc3208ac9e0e633ed17cf3e · sha256:33066a3176584f1e… · /containers/cna/references/2
{"name":"https://github.com/nats-io/nats-server/releases/tag/v2.12.3","tags":["x_refsource_MISC"],"url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2ff45444c211824cb6b0ee71b99eaab65e324fd35cc3208ac9e0e633ed17cf3e · sha256:33066a3176584f1e… · /containers/cna/references/3
{"name":"https://github.com/nats-io/nats-server/security/advisories/GHSA-qrvq-68c2-7grw","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-qrvq-68c2-7grw"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2ff45444c211824cb6b0ee71b99eaab65e324fd35cc3208ac9e0e633ed17cf3e · sha256:33066a3176584f1e… · /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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