CVE-2022-0623Public exploitNetwork attack vector

Memory disclosure or crash via non-Hash double splat

Published Feb 17, 2022 · Updated Aug 2, 2024

Out-of-bounds read in mruby before 3.2 allows remote attackers to disclose memory or crash an interpreter with crafted Ruby code. In mrb_vm_exec, double-splat bytecode trusts a register to contain a Hash and passes it to mrb_hash_set after only a debug assertion; a non-Hash operand reaches invalid memory access. Exposure requires an embedding application or interpreter to execute attacker-controlled Ruby code; integrity impact is not reported.

CVSS severity6.5
Medium
EPSS probability1.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in mruby before 3.2 allows remote attackers to disclose memory or crash an interpreter with crafted Ruby code. In mrb_vm_exec, double-splat bytecode trusts a register to contain a Hash and passes it to mrb_hash_set after only a debug assertion; a non-Hash operand reaches invalid memory access. Exposure requires an embedding application or interpreter to execute attacker-controlled Ruby code; integrity impact is not reported.

The record

CVE
CVE-2022-0623
Published
Feb 17, 2022
Updated
Aug 2, 2024
Vendor
mruby
Product
mruby
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 17, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

mruby · mrubyversion=unspecified <3.2

Published CVSS scores

6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:P
6.5huntr.devCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read

Public exploit references

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Technologies

Your stack

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Your stack

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