CVE-2025-12875
mruby array.c ary_fill_exec out-of-bounds write
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 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 exploited. This patch is called 93619f06dd378db6766666b30c08978311c7ec94. It is best practice to apply a patch to resolve this issue.
INFO
Published Date :
Nov. 7, 2025, 9:15 p.m.
Last Modified :
Dec. 2, 2025, 4:15 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Apply the patch for mruby version 3.4.0.
- Review and test the applied patch.
- Update mruby to a patched version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-12875.
| URL | Resource |
|---|---|
| https://github.com/makesoftwaresafe/mruby/commit/93619f06dd378db6766666b30c08978311c7ec94 | Patch |
| https://github.com/mruby/mruby/issues/6650 | Issue Tracking |
| https://github.com/mruby/mruby/issues/6650#event-20443453808 | Issue Tracking |
| https://github.com/mruby/mruby/issues/6650#issuecomment-3430851605 | Patch |
| https://vuldb.com/?ctiid.331511 | Permissions Required VDB Entry |
| https://vuldb.com/?id.331511 | Third Party Advisory VDB Entry |
| https://vuldb.com/?submit.680879 | Third Party Advisory VDB Entry |
| https://github.com/mruby/mruby/issues/6650 | Issue Tracking |
| https://github.com/mruby/mruby/issues/6650#issuecomment-3430851605 | Patch |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-12875 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-12875
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-12875 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-12875 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Dec. 02, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-787 Added CPE Configuration OR *cpe:2.3:a:mruby:mruby:3.4.0:*:*:*:*:ruby:*:* Added Reference Type VulDB: https://github.com/makesoftwaresafe/mruby/commit/93619f06dd378db6766666b30c08978311c7ec94 Types: Patch Added Reference Type CISA-ADP: https://github.com/mruby/mruby/issues/6650 Types: Issue Tracking Added Reference Type VulDB: https://github.com/mruby/mruby/issues/6650 Types: Issue Tracking Added Reference Type VulDB: https://github.com/mruby/mruby/issues/6650#event-20443453808 Types: Issue Tracking Added Reference Type CISA-ADP: https://github.com/mruby/mruby/issues/6650#issuecomment-3430851605 Types: Patch Added Reference Type VulDB: https://github.com/mruby/mruby/issues/6650#issuecomment-3430851605 Types: Patch Added Reference Type VulDB: https://vuldb.com/?ctiid.331511 Types: Permissions Required, VDB Entry Added Reference Type VulDB: https://vuldb.com/?id.331511 Types: Third Party Advisory, VDB Entry Added Reference Type VulDB: https://vuldb.com/?submit.680879 Types: Third Party Advisory, VDB Entry -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Nov. 13, 2025
Action Type Old Value New Value Added Reference https://github.com/mruby/mruby/issues/6650 Added Reference https://github.com/mruby/mruby/issues/6650#issuecomment-3430851605 -
New CVE Received by [email protected]
Nov. 07, 2025
Action Type Old Value New Value Added 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 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 exploited. This patch is called 93619f06dd378db6766666b30c08978311c7ec94. It is best practice to apply a patch to resolve this issue. Added CVSS V4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L Added CVSS V2 (AV:L/AC:L/Au:S/C:P/I:P/A:P) Added CWE CWE-119 Added CWE CWE-787 Added Reference https://github.com/makesoftwaresafe/mruby/commit/93619f06dd378db6766666b30c08978311c7ec94 Added Reference https://github.com/mruby/mruby/issues/6650 Added Reference https://github.com/mruby/mruby/issues/6650#event-20443453808 Added Reference https://github.com/mruby/mruby/issues/6650#issuecomment-3430851605 Added Reference https://vuldb.com/?ctiid.331511 Added Reference https://vuldb.com/?id.331511 Added Reference https://vuldb.com/?submit.680879