CVE-2022-1071Public exploit

Memory corruption via stale VM stack pointer

Published Mar 26, 2022 · Updated Aug 2, 2024

Use-after-free in mruby before 3.2 allows local users to corrupt interpreter memory by executing crafted Ruby code. In mrb_vm_exec, calls such as hash, string, and constant lookups can reallocate the VM stack while an assignment still uses the stale regs pointer. Exploitation requires local execution and user interaction in a privileged hosting context, with compromise bounded to that process and its security context.

CVSS severity8.2
High
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in mruby before 3.2 allows local users to corrupt interpreter memory by executing crafted Ruby code. In mrb_vm_exec, calls such as hash, string, and constant lookups can reallocate the VM stack while an assignment still uses the stale regs pointer. Exploitation requires local execution and user interaction in a privileged hosting context, with compromise bounded to that process and its security context.

The record

CVE
CVE-2022-1071
Published
Mar 26, 2022
Updated
Aug 2, 2024
Vendor
mruby
Product
mruby
Classifications
CWE-416, T1203
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 26, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=unspecified <3.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

mruby · mrubyversion=unspecified <3.2

Published CVSS scores

8.2NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.7huntr.devCVSS:3.0/AV:L/AC:L/PR:H/UI:R/S:C/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.

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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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

Public exploit references

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Technologies

Your stack

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Your stack

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