{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*",
              "cpe:2.3:a:bytecodealliance:wasmtime:44.0.0:*:*:*:*:rust:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "30.0.0"
              },
              {
                "fixed": "36.0.8"
              },
              {
                "introduced": "37.0.0"
              },
              {
                "fixed": "43.0.2"
              },
              {
                "introduced": "44.0.0"
              },
              {
                "last_affected": "44.0.0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING"
            ]
          },
          "events": [
            {
              "introduced": "ede663c2ac43dad89877844440e53e0214468f03"
            },
            {
              "fixed": "332e8ad2374e78adba1127f725d6603a4a5f96f3"
            },
            {
              "introduced": "7b3d6ae79e9153a2477668062f5622c10333925f"
            },
            {
              "fixed": "f8557c1ad85b8fc123b715d15db7b52483eade96"
            },
            {
              "introduced": "af382d7d946b3de82db4bb1f6065b565f97446ae"
            },
            {
              "last_affected": "af382d7d946b3de82db4bb1f6065b565f97446ae"
            }
          ],
          "repo": "https://github.com/bytecodealliance/wasmtime",
          "type": "GIT"
        }
      ],
      "versions": [
        "44.0.0"
      ]
    }
  ],
  "aliases": [
    "GHSA-p8xm-42r7-89xg"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44216.json"
  },
  "details": "Wasmtime is a runtime for WebAssembly. From 30.0.0 to 36.0.8, 43.0.2, and 44.0.1, Wasmtime's allocation logic for a WebAssembly table contained checked arithmetic which panicked on overflow. This overflow is possible to trigger, and thus panic, when a table with an extremely large size is allocated. This is possible with the WebAssembly memory64 proposal where tables can have sizes in the 64-bit range as opposed to the previous 32-bit range which would not overflow. The panic happens when attempting to create a very large table, such as when instantiating a WebAssembly module or component. This vulnerability is fixed in 36.0.8, 43.0.2, and 44.0.1.",
  "id": "CVE-2026-44216",
  "modified": "2026-07-16T03:31:08.613951485Z",
  "published": "2026-05-14T14:54:32.975Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44216.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:38187"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-44216"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44216.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p8xm-42r7-89xg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44216"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477467"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Wasmtime: Panic when allocating a table exceeding the size of the host's address space"
}