{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "2.4.5"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "1f98fb01d09b2ef5e49dc0be2e6006f962fd87f1"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "range": [
                  {
                    "fixed": "b49d10eac4176817305d60ea59d24bc69a53eb7b"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "WAMR-2.4.5",
                "range": [
                  {
                    "fixed": "25bd7eb63e828e4bd242cc9b38d260b4b31c6605"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "25bd7eb63e828e4bd242cc9b38d260b4b31c6605"
            },
            {
              "fixed": "1f98fb01d09b2ef5e49dc0be2e6006f962fd87f1"
            },
            {
              "fixed": "b49d10eac4176817305d60ea59d24bc69a53eb7b"
            }
          ],
          "repo": "https://github.com/wasm-micro-runtime/wasm-micro-runtime",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-wj3p-xhqm-pffc"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-122"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54914.json"
  },
  "details": "WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (Wasm) runtime. Prior to 2.4.5, wasi_poll_oneoff in core/iwasm/libraries/libc-wasi/libc_wasi_wrapper.c validates the output pointer for only one wasi_event_t, while wasmtime_ssp_poll_oneoff in core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/posix.c can write as many events as the guest-controlled nsubscriptions value. A crafted guest module can provide multiple subscriptions that produce events while positioning an output region large enough for only one event, causing a later out[nevents] write to cross the validated Wasm linear-memory boundary into adjacent host heap memory. The overwrite contains partly attacker-controlled event data and can reliably crash the host process, with further confidentiality or integrity consequences depending on heap layout. This issue is fixed in version 2.4.5.",
  "id": "CVE-2026-54914",
  "modified": "2026-11-05T21:16:11.316471968Z",
  "published": "2026-11-05T17:27:16.493Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54914.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/wasm-micro-runtime/wasm-micro-runtime/commit/1f98fb01d09b2ef5e49dc0be2e6006f962fd87f1"
    },
    {
      "type": "FIX",
      "url": "https://github.com/wasm-micro-runtime/wasm-micro-runtime/commit/b49d10eac4176817305d60ea59d24bc69a53eb7b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wasm-micro-runtime/wasm-micro-runtime/releases/tag/WAMR-2.4.5"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/wasm-micro-runtime/wasm-micro-runtime/security/advisories/GHSA-wj3p-xhqm-pffc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54914"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "WebAssembly Micro Runtime: Heap Buffer Overflow in WAMR WASI poll_oneoff Output Buffer"
}