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mpack — security advisory

Type: advisorySources: OSVAdvisory ID: UBUNTU-CVE-2026-88350

An integer overflow vulnerability exists in MPack 1.1.1 in mpack_node_cstr_alloc() and mpack_node_utf8_cstr_alloc().

Products
mpack
Affected versions
1.6-17, 1.6-18, 1.6-19, 1.6-19build1, 1.6-8, 1.6-8.1, 1.6-8.2
Fixed versions
Not specified
CVEs
CVE-2026-88350
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 03:29 UTC · Revision 1

Source evidence

UBUNTU-CVE-2026-88350

core-osv · Original source

Published 22 Sept 2026, 20:17 UTC

An integer overflow vulnerability exists in MPack 1.1.1 in mpack_node_cstr_alloc() and mpack_node_utf8_cstr_alloc().

osv:UBUNTU-CVE-2026-88350

mpack

Fixed versions: Not specified

mpack

Fixed versions: Not specified

mpack

Fixed versions: Not specified

mpack

Fixed versions: Not specified

mpack

Fixed versions: Not specified

mpack

Fixed versions: Not specified

mpack

Fixed versions: Not specified

Complete source record
{
  "id": "5a1cdce8e07b91223c0b1f4355d4f98101909f1dcd32941fca17e3b85ac235c9",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-88350",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-88350",
    "summary": "An integer overflow vulnerability exists in MPack 1.1.1 in mpack_node_cstr_alloc() and mpack_node_utf8_cstr_alloc().",
    "evidence": "osv:UBUNTU-CVE-2026-88350",
    "products": [
      {
        "name": {
          "value": "mpack",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.6-8",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "mpack",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.6-8.1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.6-8.2",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "mpack",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.6-8.2",
            "evidence": "/affected/2/versions"
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      },
      {
        "name": {
          "value": "mpack",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
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            "evidence": "/affected/3/versions"
          },
          {
            "value": "1.6-18",
            "evidence": "/affected/3/versions"
          }
        ]
      },
      {
        "name": {
          "value": "mpack",
          "evidence": "/affected/4/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
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          }
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      },
      {
        "name": {
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          "evidence": "/affected/5/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
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            "evidence": "/affected/5/versions"
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      },
      {
        "name": {
          "value": "mpack",
          "evidence": "/affected/6/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.6-19",
            "evidence": "/affected/6/versions"
          },
          {
            "value": "1.6-19build1",
            "evidence": "/affected/6/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "UBUNTU-CVE-2026-88350",
      "aliases": [
        "UBUNTU-CVE-2026-88350"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "mpack",
            "purl": "pkg:deb/ubuntu/mpack?arch=source&distro=xenial",
            "ecosystem": "Ubuntu:16.04:LTS"
          },
          "versions": [
            "1.6-8"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88350.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "mpack",
                "binary_version": "1.6-8"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
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              ]
            }
          ],
          "package": {
            "name": "mpack",
            "purl": "pkg:deb/ubuntu/mpack?arch=source&distro=bionic",
            "ecosystem": "Ubuntu:18.04:LTS"
          },
          "versions": [
            "1.6-8.1",
            "1.6-8.2"
          ],
          "database_specific": {
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          },
          "ecosystem_specific": {
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                "binary_version": "1.6-8.2"
              }
            ]
          }
        },
        {
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            "purl": "pkg:deb/ubuntu/mpack?arch=source&distro=focal",
            "ecosystem": "Ubuntu:20.04:LTS"
          },
          "versions": [
            "1.6-8.2"
          ],
          "database_specific": {
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          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "mpack",
                "binary_version": "1.6-8.2"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
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          ],
          "package": {
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            "purl": "pkg:deb/ubuntu/mpack?arch=source&distro=jammy",
            "ecosystem": "Ubuntu:22.04:LTS"
          },
          "versions": [
            "1.6-17",
            "1.6-18"
          ],
          "database_specific": {
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          },
          "ecosystem_specific": {
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              {
                "binary_name": "mpack",
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            ]
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            "purl": "pkg:deb/ubuntu/mpack?arch=source&distro=noble",
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            "1.6-18"
          ],
          "database_specific": {
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          },
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              }
            ]
          }
        },
        {
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            "purl": "pkg:deb/ubuntu/mpack?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "1.6-19build1"
          ],
          "database_specific": {
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          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "mpack",
                "binary_version": "1.6-19build1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
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                {
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          ],
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            "purl": "pkg:deb/ubuntu/mpack?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "1.6-19",
            "1.6-19build1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88350.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "mpack",
                "binary_version": "1.6-19build1"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T13:01:15.379190801Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-88350"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-88350",
        "https://www.cve.org/CVERecord?id=CVE-2026-88350",
        "https://github.com/ludocode/mpack/issues/124",
        "https://github.com/ludocode/mpack/commit/3d54d1215bdb5478d3ddecaf85884c58b382cd9b"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-88350",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 361387,
  "published_at": "2026-09-22T20:17:00+00:00"
}