CVE-2022-0570

Memory corruption via premature argument-stack flushing

Published Feb 13, 2022 · Updated Aug 2, 2024

Heap buffer overflow in mruby before 3.2 allows local users to corrupt memory by compiling a call with more than 15 arguments. The compiler's gen_values function flushes its value stack when the argument count exceeds the encoded limit, before it packs the completed oversized list into an array. Reachability requires attacker-controlled Ruby source to enter the compiler, and corruption is confined to the process running that source.

CVSS severity8.4
High
EPSS probability1.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in mruby before 3.2 allows local users to corrupt memory by compiling a call with more than 15 arguments. The compiler's gen_values function flushes its value stack when the argument count exceeds the encoded limit, before it packs the completed oversized list into an array. Reachability requires attacker-controlled Ruby source to enter the compiler, and corruption is confined to the process running that source.

The record

CVE
CVE-2022-0570
Published
Feb 13, 2022
Updated
Aug 2, 2024
Vendor
mruby
Product
mruby
Classifications
CWE-122, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 13, 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
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
8.4huntr.devCVSS:3.0/AV:L/AC:L/PR:N/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1203Exploitation for Client Execution

Public exploit references

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Technologies

Your stack

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Your stack

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