CVE-2022-39393

Name: CVE-2022-39393
Creator: NVD / NIST
Published: 2022-11-10T20:15:11.52+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.6/10EPSS 0.66%

Last modified Jun 17, 2026

CVE-2022-39393 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. 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. EPSS estimates a 0.66% chance of exploitation in the next 30 days.

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`.

Metrics

CVSS 3.1

8.6/10

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

EPSS Probability

0.66%

46.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Bytecodealliance	Wasmtime	< 1.0.2
Bytecodealliance	Wasmtime	>= 2.0.0, < 2.0.2

References

https://github.com/bytecodealliance/wasmtime/commit/2614f2e9d2d36805ead8a8da0fa0c6e0d9e428a0Patch, Third Party Advisory
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-wh6w-3828-g9qfThird Party Advisory
https://github.com/bytecodealliance/wasmtime/commit/2614f2e9d2d36805ead8a8da0fa0c6e0d9e428a0Patch, Third Party Advisory
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-wh6w-3828-g9qfThird Party Advisory

Timeline

Published: Nov 10, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-39393?

How severe is CVE-2022-39393?

CVE-2022-39393 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 0.66% probability of exploitation in the next 30 days.

How do I fix CVE-2022-39393?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-39393?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST