CVE-2022-31146Network attack vector

Use-after-free via omitted garbage-collector stack maps

Published Jul 20, 2022 · Updated Apr 23, 2025

Use-after-free in Cranelift for Wasmtime 0.37.0 through 0.38.1 allows attackers to corrupt host memory via WebAssembly modules. Alias resolution is omitted from the reference-valued virtual-register input to regalloc2, causing it to treat live references as dead and elide required stack maps. Exploitation requires a host to pass a non-null externref and trigger garbage collection while affected WebAssembly frames remain active.

CVSS severity6.4
Medium
EPSS probability1.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use-after-free in Cranelift for Wasmtime 0.37.0 through 0.38.1 allows attackers to corrupt host memory via WebAssembly modules. Alias resolution is omitted from the reference-valued virtual-register input to regalloc2, causing it to treat live references as dead and elide required stack maps. Exploitation requires a host to pass a non-null externref and trigger garbage collection while affected WebAssembly frames remain active.

The record

CVE
CVE-2022-31146
Published
Jul 20, 2022
Updated
Apr 23, 2025
Vendor
Bytecode Alliance
Product
Wasmtime
Classifications
CWE-416
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 20, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 0.37.0, < 0.38.2
  2. Affected versionversion=>= 0.84.0, < 0.85.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Bytecode Alliance · Wasmtimeversion=>= 0.37.0, < 0.38.2; version=>= 0.84.0, < 0.85.2

Published CVSS scores

6.4GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo