CVE-2022-31169Network attack vector

Incorrect guest results via constant divisor misextension

Published Jul 21, 2022 · Updated Apr 23, 2025

Incorrect calculation in Cranelift for Wasmtime before 0.38.2 allows context-dependent attackers to produce wrong guest results on AArch64. Cranelift's AArch64 lowering rules load sub-64-bit constant divisors without the required sign or zero extension before a 64-bit division. Reachability requires execution of a guest containing the affected division pattern on an AArch64 host; the wrong result affects guest correctness, not host isolation.

CVSS severity5.9
Medium
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect calculation in Cranelift for Wasmtime before 0.38.2 allows context-dependent attackers to produce wrong guest results on AArch64. Cranelift's AArch64 lowering rules load sub-64-bit constant divisors without the required sign or zero extension before a 64-bit division. Reachability requires execution of a guest containing the affected division pattern on an AArch64 host; the wrong result affects guest correctness, not host isolation.

The record

CVE
CVE-2022-31169
Published
Jul 21, 2022
Updated
Apr 23, 2025
Vendor
Bytecode Alliance
Product
Wasmtime
Classifications
CWE-682
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.38.2
  2. Affected versionversion=< 0.85.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Bytecode Alliance · Wasmtimeversion=< 0.38.2; version=< 0.85.2

Published CVSS scores

5.9GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-682Incorrect Calculation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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