CVE-2022-1201Public exploit

Interpreter crash via unchecked super target class

Published Apr 2, 2022 · Updated Aug 2, 2024

NULL pointer dereference in mrb_vm_exec in mruby before 3.2 allows local users to crash the interpreter through a super call. During super handling after a module target, mrb_vm_ci_target_class can return NULL, but mrb_vm_exec dereferences target_class->tt without checking it. Triggering requires local execution of crafted Ruby code in an interpreter or embedding application and causes only that process to crash.

CVSS severity7.1
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in mrb_vm_exec in mruby before 3.2 allows local users to crash the interpreter through a super call. During super handling after a module target, mrb_vm_ci_target_class can return NULL, but mrb_vm_exec dereferences target_class->tt without checking it. Triggering requires local execution of crafted Ruby code in an interpreter or embedding application and causes only that process to crash.

The record

CVE
CVE-2022-1201
Published
Apr 2, 2022
Updated
Aug 2, 2024
Vendor
mruby
Product
mruby
Classifications
CWE-476, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 2, 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 privilegesUnavailable in this record.

What is affected?

mruby · mrubyversion=unspecified <3.2

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
7.1huntr.devCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

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

Technologies

Your stack

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Your stack

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