AsyncHttpClient: WebSocket handshake continues after a failed Sec-WebSocket-Accept check

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-107284",
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "dateUpdated": "2026-10-07T21:27:03.257Z",
    "dateReserved": "2026-10-07T15:53:23.586Z",
    "datePublished": "2026-10-07T21:27:03.257Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M",
        "dateUpdated": "2026-10-07T21:27:03.257Z"
      },
      "title": "AsyncHttpClient: WebSocket handshake continues after a failed Sec-WebSocket-Accept check",
      "descriptions": [
        {
          "lang": "en",
          "value": "The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, WebSocketHandler.upgrade aborts a handshake whose Sec-WebSocket-Accept value is missing or invalid but continues into pipeline installation and onOpen delivery. Frames coalesced with the invalid 101 response can be decoded and delivered from a peer that did not prove the handshake, although the request future fails and the channel closes. This issue is fixed in versions 3.0.12 and 2.16.1."
        }
      ],
      "affected": [
        {
          "vendor": "AsyncHttpClient",
          "product": "async-http-client",
          "versions": [
            {
              "version": ">= 3.0.0, < 3.0.12",
              "status": "affected"
            },
            {
              "version": ">= 2.0.0, < 2.16.1",
              "status": "affected"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-345: Insufficient Verification of Data Authenticity",
              "cweId": "CWE-345",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-670: Always-Incorrect Control Flow Implementation",
              "cweId": "CWE-670",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-rwhr-j9rv-85f8",
          "name": "https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-rwhr-j9rv-85f8",
          "tags": [
            "x_refsource_CONFIRM"
          ]
        },
        {
          "url": "https://github.com/AsyncHttpClient/async-http-client/commit/75a278550aa9a980009d022fb4e635f9c8738c03",
          "name": "https://github.com/AsyncHttpClient/async-http-client/commit/75a278550aa9a980009d022fb4e635f9c8738c03",
          "tags": [
            "x_refsource_MISC"
          ]
        },
        {
          "url": "https://github.com/AsyncHttpClient/async-http-client/commit/ccdcaa627db6d96dcc42105212cb3ba5048bd7f9",
          "name": "https://github.com/AsyncHttpClient/async-http-client/commit/ccdcaa627db6d96dcc42105212cb3ba5048bd7f9",
          "tags": [
            "x_refsource_MISC"
          ]
        },
        {
          "url": "https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1",
          "name": "https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1",
          "tags": [
            "x_refsource_MISC"
          ]
        },
        {
          "url": "https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12",
          "name": "https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12",
          "tags": [
            "x_refsource_MISC"
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "attackVector": "NETWORK",
            "attackComplexity": "HIGH",
            "privilegesRequired": "NONE",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "availabilityImpact": "NONE",
            "baseScore": 3.7,
            "baseSeverity": "LOW"
          }
        }
      ]
    }
  }
}