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CVE-2026-55950 DTLS listener crash via race condition in dtls_packet_demux causes denial of service for all sessions

🗓️ 02 Jul 2026 16:06:24Reported by EEFType 
cvelist
 cvelist
🔗 www.cve.org👁 6 Views

Unauthenticated attacker crashes all DTLS sessions on a listener via a TOCTOU race in dtls_packet_demux.

Related
Affected
Refs
[
  {
    "cpes": [
      "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
    ],
    "defaultStatus": "unaffected",
    "modules": [
      "dtls_packet_demux"
    ],
    "packageName": "ssl",
    "packageURL": "pkg:otp/ssl?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git",
    "product": "OTP",
    "programFiles": [
      "src/dtls_packet_demux.erl"
    ],
    "programRoutines": [
      {
        "name": "dtls_packet_demux:handle_call/3"
      },
      {
        "name": "dtls_packet_demux:handle_info/2"
      },
      {
        "name": "dtls_packet_demux:new_connection/2"
      }
    ],
    "repo": "https://github.com/erlang/otp",
    "vendor": "Erlang",
    "versions": [
      {
        "changes": [
          {
            "at": "11.7.3",
            "status": "unaffected"
          },
          {
            "at": "11.6.0.3",
            "status": "unaffected"
          },
          {
            "at": "11.2.12.10",
            "status": "unaffected"
          }
        ],
        "lessThan": "*",
        "status": "affected",
        "version": "10.9",
        "versionType": "otp"
      }
    ]
  },
  {
    "collectionURL": "https://github.com",
    "cpes": [
      "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
    ],
    "defaultStatus": "unaffected",
    "modules": [
      "dtls_packet_demux"
    ],
    "packageName": "erlang/otp",
    "packageURL": "pkg:github/erlang/otp",
    "product": "OTP",
    "programFiles": [
      "lib/ssl/src/dtls_packet_demux.erl"
    ],
    "programRoutines": [
      {
        "name": "dtls_packet_demux:handle_call/3"
      },
      {
        "name": "dtls_packet_demux:handle_info/2"
      },
      {
        "name": "dtls_packet_demux:new_connection/2"
      }
    ],
    "repo": "https://github.com/erlang/otp",
    "vendor": "Erlang",
    "versions": [
      {
        "changes": [
          {
            "at": "29.0.3",
            "status": "unaffected"
          },
          {
            "at": "28.5.0.3",
            "status": "unaffected"
          },
          {
            "at": "27.3.4.14",
            "status": "unaffected"
          }
        ],
        "lessThan": "*",
        "status": "affected",
        "version": "25.3",
        "versionType": "otp"
      },
      {
        "lessThan": "e44d2bf01c4473ef2ea7f09e3523cf96de6e4a04",
        "status": "affected",
        "version": "44dcb4c3d900777493ce2a6129f451aa475811f9",
        "versionType": "git"
      }
    ]
  }
]

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