CVE-2022-0631Public exploit

Memory corruption via empty packed send arguments

Published Feb 18, 2022 · Updated Aug 2, 2024

Heap-based buffer overflow in mruby before 3.2 allows local users to corrupt interpreter memory through an empty packed argument array. The mrb_f_send function enters packed-argument mode when n equals 15 and reads element zero of regs[0] without checking that the array contains an element. Exploitation requires locally processed Ruby code or bytecode to invoke send in that form, affecting the interpreter or its embedding host process.

CVSS severity5.9
Medium
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

Heap-based buffer overflow in mruby before 3.2 allows local users to corrupt interpreter memory through an empty packed argument array. The mrb_f_send function enters packed-argument mode when n equals 15 and reads element zero of regs[0] without checking that the array contains an element. Exploitation requires locally processed Ruby code or bytecode to invoke send in that form, affecting the interpreter or its embedding host process.

The record

CVE
CVE-2022-0631
Published
Feb 18, 2022
Updated
Aug 2, 2024
Vendor
mruby
Product
mruby
Classifications
CWE-122
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 18, 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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.9huntr.devCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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 exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow

Public exploit references

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Technologies

Your stack

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Your stack

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