What is CVE-2022-1071?

CVE-2022-1071 is a high-severity vulnerability in Mruby, classified under Use After Free. CVSS score: 8.2/10. Published 2022-03-26.

How severe is CVE-2022-1071?

High severity. CVSS v3 base score is 8.2 out of 10.

Use After Free in Mruby

CVE-2022-1071

User after free in mrb_vm_exec in GitHub repository mruby/mruby prior to 3.2.

Vulnerability class: Use-After-Free

Published 2022-03-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Mruby
Mruby Mruby/mruby — versions unspecified

Weakness classification (CWE)

CWE-416 — Use After Free

References

huntr.dev/bounties/6597ece9-07af-415b-809b-919ce0a17cf3 (Exploit, Patch, Third Party Advisory)
github.com/mruby/mruby/commit/aaa28a508903041dd7399d4159a8ace9766b022f (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-1071?: CVE-2022-1071 is a high-severity vulnerability in Mruby, classified under Use After Free. CVSS score: 8.2/10. Published 2022-03-26.
How severe is CVE-2022-1071?: High severity. CVSS v3 base score is 8.2 out of 10.