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erlang-cowlib, rabbitmq-server — security advisory

Type: advisorySources: OSVAdvisory ID: UBUNTU-CVE-2026-59248

Allocation of resources without limits vulnerability in ninenines cowlib allows an unauthenticated remote HTTP/2 or HTTP/3 peer to exhaust memory on the vulnerable server (or client) and cause a denial of service. The HPACK and QPACK prefixed-integer decoder cow_hpack_common:dec_big_int/3 in src/cow_hpack_common.hrl (invoked from cow_hpack:decode/2 in src/cow_hpack.erl and from cow_qpack:decode_field_section/3 in src/cow_qpack.erl) reads continuation octets until it sees one whose high bit is clear, evaluating Int + (Value bsl M) at each step with the shift M growing by seven per octet. No limit is enforced on the number of continuation octets, on the resulting bit width, or on the value; the decoder consumes whatever encoded length the peer supplies. Because Erlang integers are immutable, each intermediate Value bsl M and each accumulator update allocates a fresh bignum whose digit width grows linearly with the number of octets processed so far. Summed across the whole decode, the transient bignum digit materialization is on the order of the square of the encoded length. A single maximal HPACK indexed representation carried inside one HTTP/2 HEADERS plus one CONTINUATION frame at Cowboy's default max_frame_size_received can force hundreds of megabytes of transient allocation and garbage-collection churn before the resulting header-table index is rejected as invalid. Repeated or concurrent connections multiply the pressure and can drive the Erlang VM to memory exhaustion. Cow

Products
erlang-cowlib, rabbitmq-server
Affected versions
1.3.0-1, 1.3.0-2, 1.3.0-3, 1.3.0-3build1, 2.19.0-1, 3.12.1-1, 3.12.1-1ubuntu1, 3.12.1-1ubuntu1.2, 3.12.1-1ubuntu1.4, 3.5.4-1, 3.5.4-3, 3.5.4-3.1, 3.5.7-1, 3.5.7-1ubuntu0.16.04.1, 3.5.7-1ubuntu0.16.04.2, 3.5.7-1ubuntu0.16.04.4, 3.5.7-1ubuntu0.16.04.4+esm1, 3.5.7-1ubuntu0.16.04.4+esm2, 3.5.7-1ubuntu0.16.04.4+esm3, 3.6.10-1, 3.6.10-1ubuntu0.1, 3.6.10-1ubuntu0.3, 3.6.10-1ubuntu0.4, 3.6.10-1ubuntu0.5, 3.6.10-1ubuntu0.5+esm1, 3.7.18-1, 3.7.8-4ubuntu2, 3.8.2-0ubuntu1, 3.8.2-0ubuntu1.1, 3.8.2-0ubuntu1.2, 3.8.2-0ubuntu1.3, 3.8.2-0ubuntu1.4, 3.8.2-0ubuntu1.5, 3.8.3-0ubuntu0.1, 3.8.3-0ubuntu0.2, 3.8.3-0ubuntu0.3, 3.8.9-3ubuntu1, 3.9.13-1, 3.9.13-1ubuntu0.22.04.1, 3.9.13-1ubuntu0.22.04.2, 3.9.27-0ubuntu0.1, 3.9.27-0ubuntu0.2, 3.9.8-1, 3.9.8-2, 3.9.8-3, 3.9.8-5, 3.9.8-6, 4.0.5-10ubuntu1, 4.0.5-10ubuntu2, 4.0.5-10ubuntu3, 4.0.5-10ubuntu4, 4.0.5-10ubuntu5, 4.0.5-8ubuntu2, 4.3.2-4ubuntu2, 4.3.2-4ubuntu3
Fixed versions
3.12.1-1ubuntu1.6, 3.8.3-0ubuntu0.3+esm1, 3.9.27-0ubuntu0.5, 4.0.5-10ubuntu5.1
CVEs
CVE-2026-59248
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 02:49 UTC · Revision 1

Source evidence

UBUNTU-CVE-2026-59248

core-osv · Original source

Published 28 Jul 2026, 10:16 UTC

Allocation of resources without limits vulnerability in ninenines cowlib allows an unauthenticated remote HTTP/2 or HTTP/3 peer to exhaust memory on the vulnerable server (or client) and cause a denial of service. The HPACK and QPACK prefixed-integer decoder cow_hpack_common:dec_big_int/3 in src/cow_hpack_common.hrl (invoked from cow_hpack:decode/2 in src/cow_hpack.erl and from cow_qpack:decode_field_section/3 in src/cow_qpack.erl) reads continuation octets until it sees one whose high bit is clear, evaluating Int + (Value bsl M) at each step with the shift M growing by seven per octet. No limit is enforced on the number of continuation octets, on the resulting bit width, or on the value; the decoder consumes whatever encoded length the peer supplies. Because Erlang integers are immutable, each intermediate Value bsl M and each accumulator update allocates a fresh bignum whose digit width grows linearly with the number of octets processed so far. Summed across the whole decode, the transient bignum digit materialization is on the order of the square of the encoded length. A single maximal HPACK indexed representation carried inside one HTTP/2 HEADERS plus one CONTINUATION frame at Cowboy's default max_frame_size_received can force hundreds of megabytes of transient allocation and garbage-collection churn before the resulting header-table index is rejected as invalid. Repeated or concurrent connections multiply the pressure and can drive the Erlang VM to memory exhaustion. Cow

osv:UBUNTU-CVE-2026-59248

rabbitmq-server

Fixed versions: Not specified

erlang-cowlib

Fixed versions: Not specified

rabbitmq-server

Fixed versions: Not specified

erlang-cowlib

Fixed versions: Not specified

rabbitmq-server

Fixed versions: 3.8.3-0ubuntu0.3+esm1

erlang-cowlib

Fixed versions: Not specified

erlang-cowlib

Fixed versions: Not specified

rabbitmq-server

Fixed versions: 3.9.27-0ubuntu0.5

erlang-cowlib

Fixed versions: Not specified

rabbitmq-server

Fixed versions: 3.12.1-1ubuntu1.6

erlang-cowlib

Fixed versions: Not specified

rabbitmq-server

Fixed versions: Not specified

erlang-cowlib

Fixed versions: Not specified

rabbitmq-server

Fixed versions: 4.0.5-10ubuntu5.1

Complete source record
{
  "id": "0f5f59e0794155858bcd35d79f9e289ac7f29c133689e11e76dc1137252f54c4",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-59248",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-59248",
    "summary": "Allocation of resources without limits vulnerability in ninenines cowlib allows an unauthenticated remote HTTP/2 or HTTP/3 peer to exhaust memory on the vulnerable server (or client) and cause a denial of service. The HPACK and QPACK prefixed-integer decoder cow_hpack_common:dec_big_int/3 in src/cow_hpack_common.hrl (invoked from cow_hpack:decode/2 in src/cow_hpack.erl and from cow_qpack:decode_field_section/3 in src/cow_qpack.erl) reads continuation octets until it sees one whose high bit is clear, evaluating Int + (Value bsl M) at each step with the shift M growing by seven per octet. No limit is enforced on the number of continuation octets, on the resulting bit width, or on the value; the decoder consumes whatever encoded length the peer supplies. Because Erlang integers are immutable, each intermediate Value bsl M and each accumulator update allocates a fresh bignum whose digit width grows linearly with the number of octets processed so far. Summed across the whole decode, the transient bignum digit materialization is on the order of the square of the encoded length. A single maximal HPACK indexed representation carried inside one HTTP/2 HEADERS plus one CONTINUATION frame at Cowboy's default max_frame_size_received can force hundreds of megabytes of transient allocation and garbage-collection churn before the resulting header-table index is rejected as invalid. Repeated or concurrent connections multiply the pressure and can drive the Erlang VM to memory exhaustion. Cow",
    "evidence": "osv:UBUNTU-CVE-2026-59248",
    "products": [
      {
        "name": {
          "value": "rabbitmq-server",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
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        "affected_versions": [
          {
            "value": "3.5.4-1",
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          {
            "value": "3.5.4-3",
            "evidence": "/affected/0/versions"
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          {
            "value": "3.5.4-3.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.5.7-1",
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          },
          {
            "value": "3.5.7-1ubuntu0.16.04.1",
            "evidence": "/affected/0/versions"
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          {
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          {
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            "value": "1.3.0-1",
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      {
        "name": {
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          },
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          {
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          {
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          {
            "value": "3.6.10-1ubuntu0.5",
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          {
            "value": "3.6.10-1ubuntu0.5+esm1",
            "evidence": "/affected/2/versions"
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        ]
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      {
        "name": {
          "value": "erlang-cowlib",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
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          {
            "value": "1.3.0-2",
            "evidence": "/affected/3/versions"
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        ]
      },
      {
        "name": {
          "value": "rabbitmq-server",
          "evidence": "/affected/4/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.8.3-0ubuntu0.3+esm1",
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        ],
        "affected_versions": [
          {
            "value": "3.7.8-4ubuntu2",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "3.7.18-1",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "3.8.2-0ubuntu1",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "3.8.2-0ubuntu1.1",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "3.8.2-0ubuntu1.2",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "3.8.2-0ubuntu1.3",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "3.8.2-0ubuntu1.4",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "3.8.2-0ubuntu1.5",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "3.8.3-0ubuntu0.1",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "3.8.3-0ubuntu0.2",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "3.8.3-0ubuntu0.3",
            "evidence": "/affected/4/versions"
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        ]
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      {
        "name": {
          "value": "erlang-cowlib",
          "evidence": "/affected/5/package/name"
        },
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          {
            "value": "1.3.0-3",
            "evidence": "/affected/5/versions"
          }
        ]
      },
      {
        "name": {
          "value": "erlang-cowlib",
          "evidence": "/affected/6/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.3.0-3",
            "evidence": "/affected/6/versions"
          }
        ]
      },
      {
        "name": {
          "value": "rabbitmq-server",
          "evidence": "/affected/7/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.9.27-0ubuntu0.5",
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        ],
        "affected_versions": [
          {
            "value": "3.8.9-3ubuntu1",
            "evidence": "/affected/7/versions"
          },
          {
            "value": "3.9.8-1",
            "evidence": "/affected/7/versions"
          },
          {
            "value": "3.9.8-2",
            "evidence": "/affected/7/versions"
          },
          {
            "value": "3.9.8-3",
            "evidence": "/affected/7/versions"
          },
          {
            "value": "3.9.8-5",
            "evidence": "/affected/7/versions"
          },
          {
            "value": "3.9.8-6",
            "evidence": "/affected/7/versions"
          },
          {
            "value": "3.9.13-1",
            "evidence": "/affected/7/versions"
          },
          {
            "value": "3.9.13-1ubuntu0.22.04.1",
            "evidence": "/affected/7/versions"
          },
          {
            "value": "3.9.13-1ubuntu0.22.04.2",
            "evidence": "/affected/7/versions"
          },
          {
            "value": "3.9.27-0ubuntu0.1",
            "evidence": "/affected/7/versions"
          },
          {
            "value": "3.9.27-0ubuntu0.2",
            "evidence": "/affected/7/versions"
          }
        ]
      },
      {
        "name": {
          "value": "erlang-cowlib",
          "evidence": "/affected/8/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.3.0-3",
            "evidence": "/affected/8/versions"
          }
        ]
      },
      {
        "name": {
          "value": "rabbitmq-server",
          "evidence": "/affected/9/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.12.1-1ubuntu1.6",
            "evidence": "/affected/9/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "3.12.1-1",
            "evidence": "/affected/9/versions"
          },
          {
            "value": "3.12.1-1ubuntu1",
            "evidence": "/affected/9/versions"
          },
          {
            "value": "3.12.1-1ubuntu1.2",
            "evidence": "/affected/9/versions"
          },
          {
            "value": "3.12.1-1ubuntu1.4",
            "evidence": "/affected/9/versions"
          }
        ]
      },
      {
        "name": {
          "value": "erlang-cowlib",
          "evidence": "/affected/10/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.3.0-3build1",
            "evidence": "/affected/10/versions"
          },
          {
            "value": "2.19.0-1",
            "evidence": "/affected/10/versions"
          }
        ]
      },
      {
        "name": {
          "value": "rabbitmq-server",
          "evidence": "/affected/11/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "4.0.5-10ubuntu5",
            "evidence": "/affected/11/versions"
          },
          {
            "value": "4.3.2-4ubuntu2",
            "evidence": "/affected/11/versions"
          },
          {
            "value": "4.3.2-4ubuntu3",
            "evidence": "/affected/11/versions"
          }
        ]
      },
      {
        "name": {
          "value": "erlang-cowlib",
          "evidence": "/affected/12/package/name"
        },
        "prerequisites": [],
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        "affected_versions": [
          {
            "value": "1.3.0-3",
            "evidence": "/affected/12/versions"
          },
          {
            "value": "1.3.0-3build1",
            "evidence": "/affected/12/versions"
          }
        ]
      },
      {
        "name": {
          "value": "rabbitmq-server",
          "evidence": "/affected/13/package/name"
        },
        "prerequisites": [],
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          {
            "value": "4.0.5-10ubuntu5.1",
            "evidence": "/affected/13/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "4.0.5-8ubuntu2",
            "evidence": "/affected/13/versions"
          },
          {
            "value": "4.0.5-10ubuntu1",
            "evidence": "/affected/13/versions"
          },
          {
            "value": "4.0.5-10ubuntu2",
            "evidence": "/affected/13/versions"
          },
          {
            "value": "4.0.5-10ubuntu3",
            "evidence": "/affected/13/versions"
          },
          {
            "value": "4.0.5-10ubuntu4",
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          },
          {
            "value": "4.0.5-10ubuntu5",
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          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "UBUNTU-CVE-2026-59248",
      "aliases": [
        "UBUNTU-CVE-2026-59248"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
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        {
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
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                }
              ]
            }
          ],
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            "purl": "pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra-legacy%2Fxenial",
            "ecosystem": "Ubuntu:Pro:16.04:LTS"
          },
          "versions": [
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            "3.5.7-1ubuntu0.16.04.4+esm2",
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          ],
          "database_specific": {
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          },
          "ecosystem_specific": {
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          ],
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          },
          "versions": [
            "1.3.0-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "erlang-cowlib",
                "binary_version": "1.3.0-1"
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            ]
          }
        },
        {
          "ranges": [
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            }
          ],
          "package": {
            "name": "rabbitmq-server",
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            "ecosystem": "Ubuntu:Pro:18.04:LTS"
          },
          "versions": [
            "3.6.10-1",
            "3.6.10-1ubuntu0.1",
            "3.6.10-1ubuntu0.3",
            "3.6.10-1ubuntu0.4",
            "3.6.10-1ubuntu0.5",
            "3.6.10-1ubuntu0.5+esm1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "rabbitmq-server",
                "binary_version": "3.6.10-1ubuntu0.5+esm1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "erlang-cowlib",
            "purl": "pkg:deb/ubuntu/erlang-cowlib?arch=source&distro=bionic",
            "ecosystem": "Ubuntu:18.04:LTS"
          },
          "versions": [
            "1.3.0-2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "erlang-cowlib",
                "binary_version": "1.3.0-2"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3.8.3-0ubuntu0.3+esm1"
                }
              ]
            }
          ],
          "package": {
            "name": "rabbitmq-server",
            "purl": "pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra%2Ffocal",
            "ecosystem": "Ubuntu:Pro:20.04:LTS"
          },
          "versions": [
            "3.7.8-4ubuntu2",
            "3.7.18-1",
            "3.8.2-0ubuntu1",
            "3.8.2-0ubuntu1.1",
            "3.8.2-0ubuntu1.2",
            "3.8.2-0ubuntu1.3",
            "3.8.2-0ubuntu1.4",
            "3.8.2-0ubuntu1.5",
            "3.8.3-0ubuntu0.1",
            "3.8.3-0ubuntu0.2",
            "3.8.3-0ubuntu0.3"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "rabbitmq-server",
                "binary_version": "3.8.3-0ubuntu0.3+esm1"
              }
            ],
            "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
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      "modified": "2026-10-17T12:59:14.381438281Z",
      "provider": "osv",
      "upstream": [
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      "references": [
        "https://ubuntu.com/security/CVE-2026-59248",
        "https://www.cve.org/CVERecord?id=CVE-2026-59248",
        "https://cna.erlef.org/cves/CVE-2026-59248.html",
        "https://ubuntu.com/security/notices/USN-8869-1"
      ]
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      {
        "value": "CVE-2026-59248",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 359520,
  "published_at": "2026-07-28T10:16:00+00:00"
}