CVE-2025-12875

mruby array.c ary_fill_exec out-of-bounds write

HIGH
7.8
CVSS Score
Published: November 7, 2025 at 08:32 PM UTC
Updated: October 19, 2026 at 01:10 PM UTC
1 product affected across 1 vendorMruby

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (8)

VDB EntryTechnical DescriptionThird Party Advisory
Source: cverecord
https://vuldb.com/?id.331511
SignaturePermissions RequiredVDB Entry
Source: cverecord
https://vuldb.com/?ctiid.331511
Third Party AdvisoryVDB Entry
Source: cverecord
https://vuldb.com/?submit.680879
Issue Tracking
Source: cverecord
https://github.com/mruby/mruby/issues/6650
Product
Source: cverecord
https://github.com/mruby/mruby/

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-787CWE-119

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