Wasmi's Linear Memory has a Critical Use After Free Vulnerability

{
  "id": "0c72b65d4e6fb07d827811eb845503948c2675cbddcd2f3be486e2481d1be7ae",
  "url": "https://osv.dev/vulnerability/CVE-2025-66627",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Wasmi's Linear Memory has a Critical Use After Free Vulnerability",
    "summary": "Wasmi is a WebAssembly interpreter focused on constrained and embedded systems. In versions 0.41.0, 0.41.1, 0.42.0 through 0.47.1, 0.50.0 through 0.51.2 and 1.0.0, Wasmi's linear memory implementation leads to a Use After Free vulnerability, triggered by a WebAssembly module under certain memory growth conditions. This issue potentially leads to memory corruption, information disclosure, or code execution. This issue is fixed in versions 0.41.2, 0.47.1, 0.51.3 and 1.0.1. To workaround this issue, consider limiting the maximum linear memory sizes where feasible.",
    "evidence": "osv:CVE-2025-66627",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-66627",
      "aliases": [
        "CVE-2025-66627",
        "GHSA-g4v2-cjqp-rfmq"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/wasmi-labs/wasmi",
              "type": "GIT",
              "events": [
                {
                  "introduced": "7188f7f085af2c862d3807183dd4061e5dd79419"
                },
                {
                  "fixed": "4a350204a8b8d07d3ab3e21e19f2fdfbe25e5e9a"
                },
                {
                  "introduced": "572b76c9c3b5afe67d3a527e0f40c9c24e392f21"
                },
                {
                  "fixed": "a2a4616b28d7dda839997563e3a2f55cd35b551f"
                },
                {
                  "introduced": "c3292187cf9760e74f3c934068b31b6be0360808"
                },
                {
                  "fixed": "e4a8ffd854bf7cb48ff9d646870ea223af89fca3"
                },
                {
                  "introduced": "2337ea2292b0762f780ebf0fe72831e6b5f8b93a"
                },
                {
                  "last_affected": "2337ea2292b0762f780ebf0fe72831e6b5f8b93a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:wasmi-labs:wasmi:*:*:*:*:*:rust:*:*",
                    "range": [
                      {
                        "introduced": "0.41.0"
                      },
                      {
                        "fixed": "0.41.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:wasmi-labs:wasmi:*:*:*:*:*:rust:*:*",
                    "range": [
                      {
                        "introduced": "0.47.0"
                      },
                      {
                        "fixed": "0.47.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:wasmi-labs:wasmi:*:*:*:*:*:rust:*:*",
                    "range": [
                      {
                        "introduced": "0.51.0"
                      },
                      {
                        "fixed": "0.51.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:wasmi-labs:wasmi:1.0.0:*:*:*:*:rust:*:*",
                    "range": [
                      {
                        "introduced": "1.0.0"
                      },
                      {
                        "last_affected": "1.0.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.0.0",
            "v0.41.1",
            "v0.47.0",
            "v1.0.0",
            "v0.51.2",
            "v0.51.1",
            "v0.51.0",
            "v0.41.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-66627.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:35.310953365Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66627.json",
        "https://github.com/wasmi-labs/wasmi/security/advisories/GHSA-g4v2-cjqp-rfmq",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-66627"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-416"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66627.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-66627",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 502275,
  "published_at": "2025-12-09T02:52:46.938+00:00"
}