{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.0.4"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0f153a63b7552a0e8721f640984113e419015026"
            }
          ],
          "repo": "https://github.com/stablelib/stablelib",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-w48f-fwg7-ww6p"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1321"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106448.json"
  },
  "details": "StableLib is a stable library of useful TypeScript and JavaScript code. Prior to 2.0.4, the @stablelib/cbor CBOR map decoding path creates ordinary JavaScript objects and assigns attacker-controlled keys with bracket assignment. A map key named __proto__ invokes the inherited prototype setter instead of creating an ordinary own property, allowing the decoded object's prototype to contain attacker-controlled authorization or feature-flag values. Downstream code that trusts normal property lookup or merges the decoded object can therefore make security-sensitive decisions using inherited attacker data. This issue is fixed in version 2.0.4.",
  "id": "CVE-2026-106448",
  "modified": "2026-10-09T02:30:53.617248418Z",
  "published": "2026-10-06T19:45:02.616Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/StableLib/stablelib/releases/tag/@stablelib/cbor@2.0.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106448.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/StableLib/stablelib/security/advisories/GHSA-w48f-fwg7-ww6p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106448"
    },
    {
      "type": "FIX",
      "url": "https://github.com/StableLib/stablelib/commit/0f153a63b7552a0e8721f640984113e419015026"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "StableLib: Prototype poisoning via `__proto__` map keys in CBOR decoding"
}