CVE-2022-0080Network attack vector

Heap corruption via failed Proc copy

Published Jan 2, 2022 · Updated May 22, 2025

Heap-based buffer overflow in mruby before 3.1 allows attackers to corrupt heap memory by triggering a failed Proc copy. In mrb_proc_copy in src/proc.c, the vulnerable sequence copies a Proc's fields before incrementing the source irep reference, so a failed copy can leave a broken reference count and corrupt heap state. Reachability requires an embedding application to execute attacker-controlled Ruby code that exercises Proc copying; the public record does not establish impact beyond memory corruption.

CVSS severity8.2
High
EPSS probability1.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Heap-based buffer overflow in mruby before 3.1 allows attackers to corrupt heap memory by triggering a failed Proc copy. In mrb_proc_copy in src/proc.c, the vulnerable sequence copies a Proc's fields before incrementing the source irep reference, so a failed copy can leave a broken reference count and corrupt heap state. Reachability requires an embedding application to execute attacker-controlled Ruby code that exercises Proc copying; the public record does not establish impact beyond memory corruption.

The record

CVE
CVE-2022-0080
Published
Jan 2, 2022
Updated
May 22, 2025
Vendor
mruby
Product
mruby
Classifications
CWE-122
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 2, 2022CVE publishedPublication date reported by the CVE source.
  2. May 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

mruby · mrubyversion=unspecified <3.1

Published CVSS scores

8.2CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
9.8NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NISTAV:N/AC:L/Au:N/C:P/I:P/A:P
8.2huntr.devCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo