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CVE-2021-4110

NULL Pointer Dereference in mruby/mruby

9.1 CriticalFix available

mruby is vulnerable to NULL Pointer Dereference

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
High
Integrity
None
Availability
High

Exploit likelihood

1.69%Up 1.1 points since Dec 15, 2021
90%50%10%1%

What each source reports

CVE List Score used 9.1

NULL Pointer Dereference in mruby/mruby

mruby is vulnerable to NULL Pointer Dereference

Record
CVE-2021-4110
CVSS 3.0
9.1 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
EUVDEUVD-2021-33991 9.1

mruby is vulnerable to NULL Pointer Dereference

Record
EUVD-2021-33991
CVSS 3.0
9.1 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Updated
2026-11-03
GitHub AdvisoriesGHSA-xvhr-qprg-rjpw No score

mruby is vulnerable to NULL Pointer Dereference

mruby is vulnerable to NULL Pointer Dereference

Record
GHSA-xvhr-qprg-rjpw
Weakness
CWE-476
Updated
2026-11-02
NVD 7.5

mruby is vulnerable to NULL Pointer Dereference

Record
CVE-2021-4110
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.0
9.1 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-476
Updated
2026-11-02
OSVALPINE-CVE-2021-4110 7.5

mruby is vulnerable to NULL Pointer Dereference

Record
ALPINE-CVE-2021-4110
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-03
OSV 7.5

mruby is vulnerable to NULL Pointer Dereference

Record
CVE-2021-4110
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-4110 7.5

mruby is vulnerable to NULL Pointer Dereference

Record
DEBIAN-CVE-2021-4110
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-4110 7.5

mruby is vulnerable to NULL Pointer Dereference

Record
UBUNTU-CVE-2021-4110
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.0
9.1 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2024:11684-1 No score

libmruby3-3.0.0-2.1 on GA media

These are all security issues fixed in the libmruby3-3.0.0-2.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11684-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mruby
Alpine:v3.17
 before 3.1.0-r0
3.1.0-r0
mruby
Alpine:v3.18
 before 3.1.0-r0
3.1.0-r0
mruby
Alpine:v3.19
 before 3.1.0-r0
3.1.0-r0
mruby
Alpine:v3.20
 before 3.1.0-r0
3.1.0-r0
mruby
Alpine:v3.21
 before 3.1.0-r0
3.1.0-r0
mruby
Alpine:v3.22
 before 3.1.0-r0
3.1.0-r0
mruby
Alpine:v3.23
 before 3.1.0-r0
3.1.0-r0
mruby
Alpine:v3.24
 before 3.1.0-r0
3.1.0-r0
mruby
Debian:12
 before 3.0.0-2
3.0.0-2
mruby
Debian:13
 before 3.0.0-2
3.0.0-2
Show 10 moreShow less
Affected packages
PackageAffectedFixed
mruby
Debian:14
 before 3.0.0-2
3.0.0-2
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
 before 3.0.0-2.1
3.0.0-2.1

History

History
RecordedChangedSources
affected, aliases, referencesOSV
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2021-4110 is a critical vulnerability (CVSS 9.1) in Mruby, published December 15, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.69%, the 77th percentile. Fixed in mruby 3.1.0-r0.

References

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