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          "lang": "en",
          "value": "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 bomb to cause excessive memory consumption, often resulting in the operating system terminating the server process. The use of compression is negotiated before authentication, so this does not require valid NATS credentials to exploit. The fix, present in versions 2.11.2 and 2.12.3, was to bounds the decompression to fail once the message was too large, instead of continuing on. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points."
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              "cweId": "CWE-409",
              "description": "CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)",
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          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
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          ],
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          "name": "https://github.com/nats-io/nats-server/commit/f77fb7c4535e6727cc1a2899cd8e6bbdd8ba2017",
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          "url": "https://github.com/nats-io/nats-server/commit/f77fb7c4535e6727cc1a2899cd8e6bbdd8ba2017"
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        {
          "name": "https://github.com/nats-io/nats-server/releases/tag/v2.11.12",
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          ],
          "url": "https://github.com/nats-io/nats-server/releases/tag/v2.11.12"
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          "name": "https://github.com/nats-io/nats-server/releases/tag/v2.12.3",
          "tags": [
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          "url": "https://github.com/nats-io/nats-server/releases/tag/v2.12.3"
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      ],
      "source": {
        "advisory": "GHSA-qrvq-68c2-7grw",
        "discovery": "UNKNOWN"
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      "title": "nats-server websockets are vulnerable to pre-auth memory DoS"
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  "cveMetadata": {
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    "dateReserved": "2026-02-20T17:40:28.448Z",
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          {
            "url": "http://www.openwall.com/lists/oss-security/2025/04/08/5"
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        "title": "CVE Program Container"
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      {
        "metrics": [
          {
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              "content": {
                "id": "CVE-2025-30215",
                "options": [
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                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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            "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-fhg8-qxh5-7q3w"
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        "title": "CISA ADP Vulnrichment"
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          "versions": [
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          "value": "NATS-Server is a High-Performance server for NATS.io, the cloud and edge native messaging system. In versions starting from 2.2.0 but prior to 2.10.27 and 2.11.1, the management of JetStream assets happens with messages in the $JS. subject namespace in the system account; this is partially exposed into regular accounts to allow account holders to manage their assets. Some of the JS API requests were missing access controls, allowing any user with JS management permissions in any account to perform certain administrative actions on any JS asset in any other account. At least one of the unprotected APIs allows for data destruction. None of the affected APIs allow disclosing stream contents. This vulnerability is fixed in v2.11.1 or v2.10.27."
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              "cweId": "CWE-306",
              "description": "CWE-306: Missing Authentication for Critical Function",
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              "type": "CWE"
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          ]
        },
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          "descriptions": [
            {
              "cweId": "CWE-287",
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      "providerMetadata": {
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          "url": "https://advisories.nats.io/CVE/secnote-2025-01.txt"
        }
      ],
      "source": {
        "advisory": "GHSA-fhg8-qxh5-7q3w",
        "discovery": "UNKNOWN"
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      "title": "NATS-Server Fails to Authorize Certain Jetstream Admin APIs"
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