msgpack5: Many buffered values can exhaust the streaming decoder stack

{
  "id": "a3e806bdbe2913d843e2a6450fd5c43295cfdc51b4266944541de655f3de9e0a",
  "url": "https://osv.dev/vulnerability/GHSA-5x5g-h9x8-2fh9",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "msgpack5: Many buffered values can exhaust the streaming decoder stack",
    "summary": "### Impact The streaming decoder recursively invokes itself for every complete value remaining in a chunk. A single chunk containing many small valid MessagePack values can exhaust the JavaScript call stack and interrupt the process or stream. ### Patches The streaming decoder now drains concatenated values iteratively with constant call-stack depth. ### Workarounds Limit the number of MessagePack values accepted in one chunk, or split large batches before passing them to the decoder stream.",
    "evidence": "osv:GHSA-5x5g-h9x8-2fh9",
    "products": [
      {
        "name": {
          "value": "msgpack5",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-5x5g-h9x8-2fh9",
      "aliases": [
        "CVE-2026-107300",
        "GHSA-5x5g-h9x8-2fh9"
      ],
      "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"
                },
                {
                  "fixed": "6.1.0"
                }
              ]
            }
          ],
          "package": {
            "name": "msgpack5",
            "purl": "pkg:npm/msgpack5",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-5x5g-h9x8-2fh9/GHSA-5x5g-h9x8-2fh9.json"
          }
        }
      ],
      "modified": "2026-10-08T18:00:08.893076738Z",
      "provider": "osv",
      "references": [
        "https://github.com/mcollina/msgpack5/security/advisories/GHSA-5x5g-h9x8-2fh9",
        "https://github.com/mcollina/msgpack5/commit/77fbef144d05def5d16fc22c37caa64c0a7efeba",
        "https://github.com/mcollina/msgpack5",
        "https://github.com/mcollina/msgpack5/releases/tag/v6.1.0"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-674"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": null,
        "github_reviewed_at": "2026-10-08T17:40:06Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107300",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 104429,
  "published_at": "2026-10-08T17:40:06+00:00"
}