GHSA-H9Q6-HC68-35RP

Vulnerability from github – Published: 2026-03-18 12:59 – Updated: 2026-03-30 13:57
VLAI?
Summary
Denial of service in github.com/shamaton/msgpack
Details

The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack.

Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/shamaton/msgpack/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.4.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/shamaton/msgpack/v3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "3.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-32284"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-18T12:59:54Z",
    "nvd_published_at": "2026-03-26T20:16:12Z",
    "severity": "HIGH"
  },
  "details": "The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack.",
  "id": "GHSA-h9q6-hc68-35rp",
  "modified": "2026-03-30T13:57:05Z",
  "published": "2026-03-18T12:59:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32284"
    },
    {
      "type": "WEB",
      "url": "https://github.com/golang/vulndb/issues/4513"
    },
    {
      "type": "WEB",
      "url": "https://github.com/shamaton/msgpack/issues/59"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/shamaton/msgpack"
    },
    {
      "type": "WEB",
      "url": "https://pkg.go.dev/vuln/GO-2026-4513"
    },
    {
      "type": "WEB",
      "url": "https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Denial of service in github.com/shamaton/msgpack"
}


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