CVE-2026-115893

{
  "id": "CVE-2026-115893",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-23T22:16:58.820",
  "lastModified": "2026-10-29T19:17:17.093",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Wasmtime is a runtime for WebAssembly. Prior to 36.0.19, 48.0.7, and 49.0.4, the Cranelift compiler backend on aarch64 can compile a Wasm br_table instruction with more than approximately 256,000 targets so that it has an incorrect conditional branch target. The branch can then jump to arbitrary other code at a user-controlled offset, allowing a user-controlled Wasm module to escape the sandbox on aarch64 engines using the default Cranelift backend. This issue is fixed in versions 36.0.19, 48.0.7, and 49.0.4."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "bytecodealliance",
          "product": "wasmtime",
          "versions": [
            {
              "version": "< 36.0.19",
              "status": "affected"
            },
            {
              "version": ">= 37.0.0, < 48.0.7",
              "status": "affected"
            },
            {
              "version": ">= 49.0.0, < 49.0.4",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "baseScore": 9.9,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 6.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-29T18:19:46.559873Z",
          "id": "CVE-2026-115893",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-691"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/bytecodealliance/wasmtime/commit/e61df1b454be9313d61a5f8de07722a421139bbe",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/bytecodealliance/wasmtime/pull/14818",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/bytecodealliance/wasmtime/pull/14819",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/bytecodealliance/wasmtime/pull/14820",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/bytecodealliance/wasmtime/pull/14826",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mghf-wjfp-p5xm",
      "source": "[email protected]"
    }
  ]
}