Denial of service in github.com/shamaton/msgpack

{
  "id": "2ae78e2f8941c85fff4613754f9de64156820c96cb823ea2a584c47949997cf8",
  "url": "https://osv.dev/vulnerability/GHSA-h9q6-hc68-35rp",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Denial of service in github.com/shamaton/msgpack",
    "summary": "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.",
    "evidence": "osv:GHSA-h9q6-hc68-35rp",
    "products": [
      {
        "name": {
          "value": "github.com/shamaton/msgpack/v2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "github.com/shamaton/msgpack/v3",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-h9q6-hc68-35rp",
      "aliases": [
        "CVE-2026-32284",
        "GHSA-h9q6-hc68-35rp",
        "GO-2026-4513"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "2.4.0"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/shamaton/msgpack/v2",
            "purl": "pkg:golang/github.com/shamaton/msgpack/v2",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-h9q6-hc68-35rp/GHSA-h9q6-hc68-35rp.json"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "3.1.0"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/shamaton/msgpack/v3",
            "purl": "pkg:golang/github.com/shamaton/msgpack/v3",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-h9q6-hc68-35rp/GHSA-h9q6-hc68-35rp.json"
          }
        }
      ],
      "modified": "2026-10-07T17:56:03.323669413Z",
      "provider": "osv",
      "references": [
        "https://nvd.nist.gov/vuln/detail/CVE-2026-32284",
        "https://github.com/golang/vulndb/issues/4513",
        "https://github.com/shamaton/msgpack/issues/59",
        "https://github.com/shamaton/msgpack",
        "https://pkg.go.dev/vuln/GO-2026-4513",
        "https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": "2026-03-26T20:16:12Z",
        "github_reviewed_at": "2026-03-18T12:59:54Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-32284",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 97137,
  "published_at": "2026-03-18T12:59:54+00:00"
}