Buffer overflow in Mruby
CVE-2025-13120
A vulnerability has been found in mruby up to 3.4.0. This vulnerability affects the function sort_cmp of the file src/array.c. Such manipulation leads to use after free. An attack has to be approached locally. The exploit has been disclosed to the public and may be used. The name of the patch is eb398971bfb43c38db3e04528b68ac9a7ce509bc. It is advisable to implement a patch to correct this issue.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.001 (3.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000
Affected products
- Mruby
- Mruby — versions 3.0, 3.1, 3.2
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/mruby/mruby/issues/6649 (issue-tracking, Issue Tracking, Vendor Advisory)
- github.com/makesoftwaresafe/mruby/pull/263 (issue-tracking, Issue Tracking)
- github.com/mruby/mruby/issues/6649 (issue-tracking, exploit, Issue Tracking, Vendor Advisory)
- github.com/mruby/mruby/commit/eb398971bfb43c38db3e04528b68ac9a7ce509bc (Patch, patch)
- github.com/mruby/mruby/ (product)
Frequently asked questions
- What is CVE-2025-13120?
- CVE-2025-13120 is a medium-severity vulnerability in Mruby, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2025-11-13.
- How severe is CVE-2025-13120?
- Medium severity. CVSS v3 base score is 5.3 out of 10.