CVE-2022-39393 - CVE House

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Status published High CVE-2022-39393

Wasmtime vulnerable to data leakage between instances in the pooling allocator

8.6 CVSS

Vulnerability Description

Wasmtime is a standalone runtime for WebAssembly. Prior to versions 2.0.2 and 1.0.2, there is a bug in Wasmtime's implementation of its pooling instance allocator where when a linear memory is reused for another instance the initial heap snapshot of the prior instance can be visible, erroneously to the next instance. This bug has been patched and users should upgrade to Wasmtime 2.0.2 and 1.0.2. Other mitigations include disabling the pooling allocator and disabling the `memory-init-cow`.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

More from bytecodealliance

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Wasmtime provides unsound API access to a WebAssembly shared linear memory

Wasmtime vulnerable to segfault when using component resources

Wasmtime has memory leak in C API with `externref` and `anyref` types

Affected Vendor

bytecodealliance

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Affected Software

wasmtime

Vulnerable Versions:

>= 2.0.0, < 2.0.2, < 1.0.2

Timeline

Official Publish: November 10th, 2022

Last Modified: May 2nd, 2025

Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Weaknesses (CWE)

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.