---
id: "CVE-2026-116841"
kind: "vulnerability"
aliases: ["CVE-2026-116841"]
title: "DevilutionX: crafted MPQ archive causes out-of-bounds heap read and crash"
severity: "medium"
cvss: 6.8
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["desktop", "devilutionx", "gaming", "runtime"]
not_affected_if: ["default-config", "official-data-only"]
published_at: "2026-10-27T01:19:07+00:00"
first_seen_at: "2026-10-27T01:34:33+00:00"
updated_at: "2026-10-27T01:36:25+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116841", "first_seen_at": "2026-10-27T01:34:33+00:00"}]
---

# DevilutionX: crafted MPQ archive causes out-of-bounds heap read and crash

DevilutionX 1.4.0 through 1.5.5 fails to bounds-check block table indexes in its bundled libmpq when resolving file hashes. A crafted .mpq archive placed in the game's data path, such as a mod, can make the game read past a heap buffer and crash.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed DevilutionX version against the affected range `1.4.0` to `1.5.5`
- Look for `.mpq` files in the game's data directory or mod folders that you did not put there

## Fix

- Upgrade DevilutionX to a version later than `1.5.5` (the sources do not name the exact fixed release)
- Remove untrusted `.mpq` mods from the data path until patched

## Timeline

- 2026-10-27T01:34:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116841

## From the sources

DevilutionX 1.4.0 through 1.5.5 contains an out-of-bounds read vulnerability in the bundled libmpq libmpq__file_number_from_hash function that allows attackers to read heap memory via unchecked block_table_index values. Attackers can place a crafted .mpq archive in the game's data path, such as a mod, to trigger reads past mpq_map and crash the game.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_