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CVE-2022-39394

Status: ModifiedCritical (9.8)—

Wasmtime is a standalone runtime for WebAssembly. Prior to version 2.0.2, there is a bug in Wasmtime's C API implementation where the definition of the `wasmtime_trap_code` does not match its declared signature in the `wasmtime/trap.h` header file. This discrepancy causes the function implementation to perform a 4-byte write into a 1-byte buffer provided by the caller. This can lead to three zero bytes being written beyond the 1-byte location provided by the caller. This bug has been patched and users should upgrade to Wasmtime 2.0.2.

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This bug can be worked around by providing a 4-byte buffer casted to a 1-byte buffer when calling `wasmtime_trap_code`. Users of the `wasmtime` crate are not affected by this issue, only users of the C API function `wasmtime_trap_code` are affected.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Bytecodealliance — Wasmtime

CWEs

References

Raw JSON (NVD)

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      "value": "Wasmtime is a standalone runtime for WebAssembly. Prior to version 2.0.2, there is a bug in Wasmtime's C API implementation where the definition of the `wasmtime_trap_code` does not match its declared signature in the `wasmtime/trap.h` header file. This discrepancy causes the function implementation to perform a 4-byte write into a 1-byte buffer provided by the caller. This can lead to three zero bytes being written beyond the 1-byte location provided by the caller. This bug has been patched and users should upgrade to Wasmtime 2.0.2. This bug can be worked around by providing a 4-byte buffer casted to a 1-byte buffer when calling `wasmtime_trap_code`. Users of the `wasmtime` crate are not affected by this issue, only users of the C API function `wasmtime_trap_code` are affected."
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      "value": "Wasmtime es un tiempo de ejecución independiente para WebAssembly. Antes de la versión 2.0.2, había un error en la implementación de la API C de Wasmtime donde la definición de `wasmtime_trap_code` no coincide con su firma declarada en el archivo de encabezado `wasmtime/trap.h`. Esta discrepancia hace que la implementación de la función realice una escritura de 4 bytes en un búfer de 1 byte proporcionado por la persona que llama. Esto puede provocar que se escriban tres bytes cero más allá de la ubicación de 1 byte proporcionada por la persona que llama. Este error ha sido corregido y los usuarios deben actualizar a Wasmtime 2.0.2. Este error se puede solucionar proporcionando un búfer de 4 bytes convertido a un búfer de 1 byte al llamar a `wasmtime_trap_code`. Los usuarios de la caja `wasmtime` no se ven afectados por este problema, solo los usuarios de la función API de C `wasmtime_trap_code` se ven afectados."
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  "lastModified": "2026-06-17T04:58:16.460",
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