What is CVE-2022-1286?

CVE-2022-1286 is a critical-severity vulnerability in Mruby, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2022-04-10.

How severe is CVE-2022-1286?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Mruby

CVE-2022-1286

heap-buffer-overflow in mrb_vm_exec in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Possible arbitrary code execution if being exploited.

Vulnerability class: Buffer Overflow

Published 2022-04-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (66.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Mruby
Mruby Mruby/mruby — versions unspecified

Weakness classification (CWE)

References

huntr.dev/bounties/f918376e-b488-4113-963d-ffe8716e4189 (Exploit, Third Party Advisory)
github.com/mruby/mruby/commit/b1d0296a937fe278239bdfac840a3fd0e93b3ee9 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-1286?: CVE-2022-1286 is a critical-severity vulnerability in Mruby, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2022-04-10.
How severe is CVE-2022-1286?: Critical severity. CVSS v3 base score is 9.8 out of 10.