Use After Free Affecting mruby/mruby package, versions [,4.0.0-rc)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-MRUBYMRUBY-14038263
- published16 Nov 2025
- disclosed13 Nov 2025
- creditTim Becker
Introduced: 13 Nov 2025
CVE-2025-13120 (opens in a new tab)How to fix?
Upgrade mruby/mruby to version 4.0.0-rc or higher.
Overview
Affected versions of this package are vulnerable to Use After Free via the sort_cmp function in the array.c file. An attacker can execute arbitrary code or cause a denial of service by triggering use of memory after it has been freed.