NULL Pointer Dereference in mrb_vm_exec with super in mruby/mruby

published 2022-04-02 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-24541

cvss: 7.1; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits: 0; none known

NULL Pointer Dereference in mrb_vm_exec with super in GitHub repository mruby/mruby prior to 3.2. This vulnerability is capable of making the mruby interpreter crash, thus affecting the availability of the system.

Patch / fix

fixed in 1 distros 3 links 1

mruby mruby/mruby 3.2

debian alpine azure linux

mruby Debian 14, Debian 13, Debian 12 3.1.0-1

debian advisories DEBIAN-CVE-2022-1201

mruby Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 3.1.0-r0

alpine advisories ALPINE-CVE-2022-1201

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

rust Azure Linux 3.0 1.75.0-1

azure linux advisories AZL-41093

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

github.com/mruby/mruby@00acae1 commit

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

huntr.dev https://huntr.dev/bounties/6f930add-c9d8-4870-ae56-d4bd8354703b referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.0	7.1	CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD	3.1	6.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
NVD	2.0	4.9	AV:L/AC:L/Au:N/C:N/I:N/A:C

Affected products

mruby mruby/mruby

Classification

Weakness

CWE-476 NULL Pointer Dereference

References

github.com /mruby/mruby/commit/00acae117da1b45b318dc36531a7b0021b8097ae
patch, third-party-advisory
huntr.dev /bounties/6f930add-c9d8-4870-ae56-d4bd8354703b
exploit, third-party-advisory

Sources

CVE List CVE-2022-1201
NVD CVE-2022-1201

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary