UnratedFix available

messagepack — security advisory

Type: advisorySources: OSVAdvisory ID: ECHO-e60c-e8f0-b786

This notice tracks CVE-2026-48509 for messagepack. Fixed in: 2.5.301.

Products: messagepack
Affected versions: Not specified
Fixed versions: 2.5.301
CVEs: CVE-2026-48509
Confirmed fixed CVEs: Not specified
Updated in this feed: 31 Oct 2026, 16:42 UTC · Revision 1

Source evidence

ECHO-e60c-e8f0-b786

core-osv · Original source

Published 22 Oct 2026, 00:00 UTC

ECHO-e60c-e8f0-b786

osv:ECHO-e60c-e8f0-b786

messagepack

Fixed versions: 2.5.301

Complete source record

{
  "id": "b152e6f739825ac199e7f9884d8a64d0296bfc836c3448a13ed2026d938ce9ad",
  "url": "https://osv.dev/vulnerability/ECHO-e60c-e8f0-b786",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ECHO-e60c-e8f0-b786",
    "summary": "ECHO-e60c-e8f0-b786",
    "evidence": "osv:ECHO-e60c-e8f0-b786",
    "products": [
      {
        "name": {
          "value": "messagepack",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.5.301",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "ECHO-e60c-e8f0-b786",
      "aliases": [
        "ECHO-e60c-e8f0-b786"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.5.301"
                }
              ]
            }
          ],
          "package": {
            "name": "messagepack",
            "purl": "pkg:nuget/messagepack",
            "ecosystem": "Echo:NuGet"
          },
          "database_specific": {
            "source": "https://advisory.echohq.com/osv/ECHO-e60c-e8f0-b786.json"
          }
        }
      ],
      "modified": "2026-10-22T00:45:09.661889236Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-48509",
        "GHSA-2f33-pr97-265q"
      ],
      "references": [
        "https://advisory.echohq.com/cve/CVE-2026-48509",
        "https://github.com/advisories/GHSA-2f33-pr97-265q"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-48509",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 401240,
  "published_at": "2026-10-22T00:00:25.004+00:00"
}