CVE-2022-1212

Use-After-Free in str_escape in mruby/mruby in mruby/mruby

9.3 CriticalFix available

Use-After-Free in str_escape in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Possible arbitrary code execution if being exploited.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: None
Availability: High

Exploit likelihood

1.79%Down 0.7 points since Apr 5, 2022

What each source reports

CVE List Score used 9.3

Use-After-Free in str_escape in mruby/mruby in mruby/mruby

Use-After-Free in str_escape in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Possible arbitrary code execution if being exploited.

Record: CVE-2022-1212
CVSS 3.0: 9.3 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H
Weakness: CWE-416
Updated: 2026-11-02

EUVDEUVD-2022-24552 9.3

Use-After-Free in str_escape in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Possible arbitrary code execution if being exploited.

Record: EUVD-2022-24552
CVSS 3.0: 9.3 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-xh66-6mj6-94rg 9.8

Use-After-Free in str_escape in mruby/mruby in GitHub repository mruby/mruby prior to 3.2....

Use-After-Free in str_escape in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Possible arbitrary code execution if being exploited.

Record: GHSA-xh66-6mj6-94rg
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-416
Updated: 2026-11-02

NVD 9.8

Use-After-Free in str_escape in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Possible arbitrary code execution if being exploited.

Record: CVE-2022-1212
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.0: 9.3 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-416
Updated: 2026-11-02

OSV 9.3

Use-After-Free in str_escape in mruby/mruby in mruby/mruby

Use-After-Free in str_escape in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Possible arbitrary code execution if being exploited.

Record: CVE-2022-1212
CVSS 3.0: 9.3 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H
Weakness: CWE-416
Updated: 2026-11-02

OSVDEBIAN-CVE-2022-1212 9.8

Use-After-Free in str_escape in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Possible arbitrary code execution if being exploited.

Record: DEBIAN-CVE-2022-1212
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-03

OSVUBUNTU-CVE-2022-1212 9.8

Use-After-Free in str_escape in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Possible arbitrary code execution if being exploited.

Record: UBUNTU-CVE-2022-1212
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.0: 9.3 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H
Updated: 2026-11-02

OSVopenSUSE-SU-2024:12024-1 No score

libmruby3_0_0-3.0.0-6.1 on GA media

These are all security issues fixed in the libmruby3_0_0-3.0.0-6.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:12024-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`mruby` Debian:12	before 3.0.0-4	3.0.0-4
`mruby` Debian:13	before 3.0.0-4	3.0.0-4
`mruby` Debian:14	before 3.0.0-4	3.0.0-4
`mruby` Ubuntu:16.04:LTS	All versions, plus listed versions 1.1.0+20150817+gita1731254-11.1.0+20150906+git1cbbb7e1-11.2.0+20160315+git4f20d58a-1	None known
`mruby` Ubuntu:18.04:LTS	All versions, plus listed versions 1.3.0-11.3.0+20170925+git38185028-11.3.0+20171029+git77edafb0-11.4.0-1	None known
`mruby` Ubuntu:20.04:LTS	All versions, plus listed versions 2.0.0-1	None known
`mruby` Ubuntu:22.04:LTS	All versions, plus listed versions 2.1.2-33.0.0-13.0.0-3	None known
`mruby` Ubuntu:24.04:LTS	All versions, plus listed versions 3.2.0-13.2.0-2	None known
`mruby` Ubuntu:25.10	All versions, plus listed versions 3.3.0-1	None known
`mruby` Ubuntu:26.10	All versions, plus listed versions 3.4.0-23.4.0-34.0.0-1	None known
`mruby` Ubuntu:26.04:LTS	All versions, plus listed versions 3.3.0-13.4.0-2	None known
`mruby` openSUSE:Tumbleweed From an advisory covering 2 CVEs	before 3.0.0-6.1	3.0.0-6.1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts	OSV
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2022-1212 is a critical vulnerability (CVSS 9.3) in Mruby, published April 5, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.79%, the 78th percentile. Fixed in mruby 3.0.0-4.

References

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