{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "2.4.5"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "b1353b5e8983047ff68829c99abf1355d5f389cf"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "WAMR-2.4.5",
                "range": [
                  {
                    "fixed": "25bd7eb63e828e4bd242cc9b38d260b4b31c6605"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "25bd7eb63e828e4bd242cc9b38d260b4b31c6605"
            },
            {
              "fixed": "b1353b5e8983047ff68829c99abf1355d5f389cf"
            }
          ],
          "repo": "https://github.com/wasm-micro-runtime/wasm-micro-runtime",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-jjv3-x3jf-cg49"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54912.json"
  },
  "details": "WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (Wasm) runtime. Prior to 2.4.5, the two-pass fast interpreter loader in core/iwasm/interpreter/wasm_loader.c can make inconsistent constant-table decisions between the sizing pass and the emitting pass. After duplicate constants inflate the first pass beyond the constant-slot limit, wasm_loader_get_const_offset emits later constants inline, but the between-pass sort and deduplication reduces the table so the second pass can choose table references and cause reserve_block_ret to emit additional copy operands that were not included in code_compiled_peak_size. A crafted module can therefore make the second pass write partially attacker-controlled compiled-code data beyond the heap buffer allocated from the first pass's size calculation during wasm_runtime_load, before guest code executes. This can corrupt host heap metadata and deterministically crash the process, causing denial of service; further consequences depend on the host application's heap layout. Builds using WAMR_BUILD_FAST_INTERP=1 are affected; disabling the fast interpreter avoids the vulnerable loader. This issue is fixed in version 2.4.5.",
  "id": "CVE-2026-54912",
  "modified": "2026-11-05T21:15:42.653404441Z",
  "published": "2026-11-05T17:29:18.708Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://gist.github.com/shumbo/b710c35b005ed871447fce385d1ab760"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54912.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/wasm-micro-runtime/wasm-micro-runtime/commit/b1353b5e8983047ff68829c99abf1355d5f389cf"
    },
    {
      "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-jjv3-x3jf-cg49"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54912"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "WAMR fast interpreter loader heap buffer overflow via constant deduplication mismatch"
}