CVE-2022-0632

Interpreter crash via OP_SUPER stack misposition

Published Feb 19, 2022 · Updated Aug 2, 2024

A NULL pointer dereference in mruby/mruby before 3.2 allows local users to cause an interpreter crash via crafted Ruby code. The mruby compiler's codegen function mispositions the stack while generating an OP_SUPER instruction, then dereferences a missing scope structure. Reaching the flaw requires executing attacker-controlled Ruby locally; the demonstrated consequence is denial of service of that interpreter process, with no evidence of data disclosure or code execution.

CVSS severity5.5
Medium
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in mruby/mruby before 3.2 allows local users to cause an interpreter crash via crafted Ruby code. The mruby compiler's codegen function mispositions the stack while generating an OP_SUPER instruction, then dereferences a missing scope structure. Reaching the flaw requires executing attacker-controlled Ruby locally; the demonstrated consequence is denial of service of that interpreter process, with no evidence of data disclosure or code execution.

The record

CVE
CVE-2022-0632
Published
Feb 19, 2022
Updated
Aug 2, 2024
Vendor
mruby
Product
mruby
Classifications
CWE-476, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 19, 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 privilegesunauthenticated

What is affected?

mruby · mrubyversion=unspecified <3.2

Published CVSS scores

5.5huntr.devCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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