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CVE-2026-24116

Estado: AnalizadaMedia (4.1)—

Wasmtime is a runtime for WebAssembly. Starting in version 29.0.0 and prior to version 36.0.5, 40.0.3, and 41.0.1, on x86-64 platforms with AVX, Wasmtime's compilation of the `f64.copysign` WebAssembly instruction with Cranelift may load 8 more bytes than is necessary. When signals-based-traps are disabled this can result in a uncaught segfault due to loading from unmapped guard pages. With guard pages disabled it's possible for out-of-sandbox data to be loaded, but unless there is another bug in Cranelift this data is not visible to WebAssembly guests.

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Wasmtime 36.0.5, 40.0.3, and 41.0.1 have been released to fix this issue. Users are recommended to upgrade to the patched versions of Wasmtime. Other affected versions are not patched and users should updated to supported major version instead. This bug can be worked around by enabling signals-based-traps. While disabling guard pages can be a quick fix in some situations, it's not recommended to disabled guard pages as it is a key defense-in-depth measure of Wasmtime.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Bytecodealliance — Wasmtime

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-24116",
  "cveTags": [],
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          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-01-27T19:22:29.285417Z"
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          "integrityImpact": "NONE",
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  "published": "2026-01-27T19:16:16.180",
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          "value": "CWE-125"
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      "lang": "en",
      "value": "Wasmtime is a runtime for WebAssembly. Starting in version 29.0.0 and prior to version 36.0.5, 40.0.3, and 41.0.1, on x86-64 platforms with AVX, Wasmtime's compilation of the `f64.copysign` WebAssembly instruction with Cranelift may load 8 more bytes than is necessary. When signals-based-traps are disabled this can result in a uncaught segfault due to loading from unmapped guard pages. With guard pages disabled it's possible for out-of-sandbox data to be loaded, but unless there is another bug in Cranelift this data is not visible to WebAssembly guests. Wasmtime 36.0.5, 40.0.3, and 41.0.1 have been released to fix this issue. Users are recommended to upgrade to the patched versions of Wasmtime. Other affected versions are not patched and users should updated to supported major version instead. This bug can be worked around by enabling signals-based-traps. While disabling guard pages can be a quick fix in some situations, it's not recommended to disabled guard pages as it is a key defense-in-depth measure of Wasmtime."
    },
    {
      "lang": "es",
      "value": "Wasmtime es un entorno de ejecución para WebAssembly. A partir de la versión 29.0.0 y antes de las versiones 36.0.5, 40.0.3 y 41.0.1, en plataformas x86-64 con AVX, la compilación de Wasmtime de la instrucción WebAssembly f64.copysign con Cranelift puede cargar 8 bytes más de los necesarios. Cuando las trampas basadas en señales están deshabilitadas, esto puede resultar en un segfault no detectado debido a la carga desde páginas de guardia no mapeadas. Con las páginas de guardia deshabilitadas, es posible que se carguen datos fuera de la sandbox, pero a menos que haya otro error en Cranelift, estos datos no son visibles para los invitados de WebAssembly. Wasmtime 36.0.5, 40.0.3 y 41.0.1 han sido lanzadas para solucionar este problema. Se recomienda a los usuarios actualizar a las versiones parcheadas de Wasmtime. Otras versiones afectadas no están parcheadas y los usuarios deberían actualizar a una versión principal compatible en su lugar. Este error se puede eludir habilitando las trampas basadas en señales. Si bien deshabilitar las páginas de guardia puede ser una solución rápida en algunas situaciones, no se recomienda deshabilitar las páginas de guardia, ya que es una medida clave de defensa en profundidad de Wasmtime."
    }
  ],
  "lastModified": "2026-06-17T10:22:39.380",
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