What is CVE-2022-1276?

CVE-2022-1276 is a critical-severity vulnerability in Mruby, classified under Out-of-bounds Read. CVSS score: 9.8/10. Published 2022-04-10.

How severe is CVE-2022-1276?

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

Out-of-bounds Read in Mruby

CVE-2022-1276

Out-of-bounds Read in mrb_get_args 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: 0.016 (74.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Mruby
Mruby Mruby/mruby — versions unspecified

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

huntr.dev/bounties/6ea041d1-e2aa-472c-bf3e-da5fa8726c25 (Exploit, Third Party Advisory)
github.com/mruby/mruby/commit/c8c083cb750606b2da81582cd8e43b442bb143e6 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-1276?: CVE-2022-1276 is a critical-severity vulnerability in Mruby, classified under Out-of-bounds Read. CVSS score: 9.8/10. Published 2022-04-10.
How severe is CVE-2022-1276?: Critical severity. CVSS v3 base score is 9.8 out of 10.