CVE-2025-12875

Medium

Description

A weakness has been identified in mruby 3.4.0. This vulnerability affects the function ary_fill_exec of the file mrbgems/mruby-array-ext/src/array.c. Executing a manipulation of the argument start/length can lead to out-of-bounds write. The attack needs to be launched locally. The exploit has been made available to the public and could be used for attacks. This patch is called 93619f06dd378db6766666b30c08978311c7ec94. It is best practice to apply a patch to resolve this issue.

SeverityMedium

CVSS5.3

Exploit probability—

ProductMruby

PublishedNov 7, 2025

First seenNov 7, 2025

Weakness typeCWE-787Out-of-bounds write CWE-119Memory buffer bounds error

How to fix

Patches

github.com/makesoftwaresafe/mruby/commit/93619f06dd378db6766666b30c08978311c7ec94

Affected products

Product	Affected versions	Fixed in
mruby mruby	3.4.0	—

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