---
id: CVE-2026-116842
title: DevilutionX 1.4.0 through 1.5.5 Heap Buffer Overflow via libmpq__archive_dup
summary: >-
  DevilutionX 1.4.0 through 1.5.5 contains a heap buffer overflow vulnerability
  in the bundled libmpq libmpq__archive_dup routine when opening crafted MPQ
  archives. Attackers can supply an MPQ archive whose block table count exceeds
  its ha…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: diasurgical
product: DevilutionX
affected:
  - DevilutionX >= 1.4.0 <= 1.5.5
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T00:34:01.167Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116842'
references:
  - url: 'https://github.com/diasurgical/DevilutionX/issues/8758'
  - url: 'https://github.com/diasurgical/DevilutionX/pull/8482'
  - url: >-
      https://github.com/diasurgical/libmpq/blob/b78d66c6fee6a501cc9b95d8556a129c68841b05/libmpq/mpq.c#L505
  - url: >-
      https://github.com/diasurgical/DevilutionX/blob/7223eeac9e8274fbf665b4de86fda26d3b22c52f/3rdParty/libmpq/CMakeLists.txt
  - url: 'https://hackmd.io/@haindpwn/devilutionx-libmpq-hash-block-table-oob'
  - url: >-
      https://www.vulncheck.com/advisories/devilutionx-1.4.0-through-1.5.5-heap-buffer-overflow-via-libmpq-archive-dup
    label: >-
      VulnCheck Advisory: DevilutionX 1.4.0 through 1.5.5 Heap Buffer Overflow
      via libmpq__archive_dup
tags:
  - cve.org
epss: 0.00134
epssPercentile: 0.02876
ingestedAt: '2026-10-27T16:11:59.182Z'
---

## Overview

DevilutionX 1.4.0 through 1.5.5 contains a heap buffer overflow vulnerability in the bundled libmpq libmpq__archive_dup routine when opening crafted MPQ archives. Attackers can supply an MPQ archive whose block table count exceeds its hash table count, causing memcpy to overflow the heap during startup and crash the game.

## Affected

- `DevilutionX >= 1.4.0 <= 1.5.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.