Out-of-bounds Write 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-13865271
- published10 Nov 2025
- disclosed7 Nov 2025
- creditTim Becker
Introduced: 7 Nov 2025
CVE-2025-12875 (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 Out-of-bounds Write via the ary_fill_exec function in the array.c file. An attacker can cause memory corruption or potentially execute arbitrary code by manipulating the start or length arguments.